Finish DB docs for Rackspace
diff --git a/rackspace/db/v1/configurations/requests.go b/rackspace/db/v1/configurations/requests.go
index 726176a..088b7ca 100644
--- a/rackspace/db/v1/configurations/requests.go
+++ b/rackspace/db/v1/configurations/requests.go
@@ -8,6 +8,7 @@
 	"github.com/rackspace/gophercloud/pagination"
 )
 
+// List will list all of the available configurations.
 func List(client *gophercloud.ServiceClient) pagination.Pager {
 	pageFn := func(r pagination.PageResult) pagination.Page {
 		return ConfigPage{pagination.SinglePageBase(r)}
@@ -16,15 +17,22 @@
 	return pagination.NewPager(client, baseURL(client), pageFn)
 }
 
+// CreateOptsBuilder is a top-level interface which renders a JSON map.
 type CreateOptsBuilder interface {
 	ToConfigCreateMap() (map[string]interface{}, error)
 }
 
+// DatastoreOpts is the primary options struct for creating and modifying
+// how configuration resources are associated with datastores.
 type DatastoreOpts struct {
-	Type    string
+	// [OPTIONAL] The type of datastore. Defaults to "MySQL".
+	Type string
+
+	// [OPTIONAL] The specific version of a datastore. Defaults to "5.6".
 	Version string
 }
 
+// ToMap renders a JSON map for a datastore setting.
 func (opts DatastoreOpts) ToMap() (map[string]string, error) {
 	datastore := map[string]string{}
 
@@ -39,13 +47,24 @@
 	return datastore, nil
 }
 
+// CreateOpts is the struct responsible for configuring new configurations.
 type CreateOpts struct {
-	Datastore   *DatastoreOpts
+	// [REQUIRED] The configuration group name
+	Name string
+
+	// [REQUIRED] A map of user-defined configuration settings that will define
+	// how each associated datastore works. Each key/value pair is specific to a
+	// datastore type.
+	Values map[string]interface{}
+
+	// [OPTIONAL] Associates the configuration group with a particular datastore.
+	Datastore *DatastoreOpts
+
+	// [OPTIONAL] A human-readable explanation for the group.
 	Description string
-	Name        string
-	Values      map[string]interface{}
 }
 
+// ToConfigCreateMap casts a CreateOpts struct into a JSON map.
 func (opts CreateOpts) ToConfigCreateMap() (map[string]interface{}, error) {
 	if opts.Name == "" {
 		return nil, errors.New("Name is a required field")
@@ -74,6 +93,7 @@
 	return map[string]interface{}{"configuration": config}, nil
 }
 
+// Create will create a new configuration group.
 func Create(client *gophercloud.ServiceClient, opts CreateOptsBuilder) CreateResult {
 	var res CreateResult
 
@@ -92,6 +112,7 @@
 	return res
 }
 
+// Get will retrieve the details for a specified configuration group.
 func Get(client *gophercloud.ServiceClient, configID string) GetResult {
 	var res GetResult
 
@@ -103,17 +124,30 @@
 	return res
 }
 
+// UpdateOptsBuilder is the top-level interface for casting update options into
+// JSON maps.
 type UpdateOptsBuilder interface {
 	ToConfigUpdateMap() (map[string]interface{}, error)
 }
 
+// UpdateOpts is the struct responsible for modifying existing configurations.
 type UpdateOpts struct {
-	Datastore   *DatastoreOpts
+	// [OPTIONAL] The configuration group name
+	Name string
+
+	// [OPTIONAL] A map of user-defined configuration settings that will define
+	// how each associated datastore works. Each key/value pair is specific to a
+	// datastore type.
+	Values map[string]interface{}
+
+	// [OPTIONAL] Associates the configuration group with a particular datastore.
+	Datastore *DatastoreOpts
+
+	// [OPTIONAL] A human-readable explanation for the group.
 	Description string
-	Name        string
-	Values      map[string]interface{}
 }
 
+// ToConfigUpdateMap will cast an UpdateOpts struct into a JSON map.
 func (opts UpdateOpts) ToConfigUpdateMap() (map[string]interface{}, error) {
 	config := map[string]interface{}{}
 
@@ -140,6 +174,9 @@
 	return map[string]interface{}{"configuration": config}, nil
 }
 
+// Update will modify an existing configuration group by performing a merge
+// between new and existing values. If the key already exists, the new value
+// will overwrite. All other keys will remain unaffected.
 func Update(client *gophercloud.ServiceClient, configID string, opts UpdateOptsBuilder) UpdateResult {
 	var res UpdateResult
 
@@ -158,6 +195,9 @@
 	return res
 }
 
+// Replace will modify an existing configuration group by overwriting the
+// entire parameter group with the new values provided. Any existing keys not
+// included in UpdateOptsBuilder will be deleted.
 func Replace(client *gophercloud.ServiceClient, configID string, opts UpdateOptsBuilder) ReplaceResult {
 	var res ReplaceResult
 
@@ -176,6 +216,7 @@
 	return res
 }
 
+// Delete will permanently delete a configuration group.
 func Delete(client *gophercloud.ServiceClient, configID string) DeleteResult {
 	var res DeleteResult
 
@@ -186,6 +227,8 @@
 	return res
 }
 
+// ListInstances will list all the instances associated with a particular
+// configuration group.
 func ListInstances(client *gophercloud.ServiceClient, configID string) pagination.Pager {
 	pageFn := func(r pagination.PageResult) pagination.Page {
 		return instances.InstancePage{pagination.LinkedPageBase{PageResult: r}}
@@ -193,6 +236,11 @@
 	return pagination.NewPager(client, instancesURL(client, configID), pageFn)
 }
 
+// ListDatastoreParams will list all the available and supported parameters
+// that can be used for a particular datastore ID and a particular version.
+// For example, if you are wondering how you can configure a MySQL 5.6 instance,
+// you can use this operation (you will need to retrieve the MySQL datastore ID
+// by using the datastores API).
 func ListDatastoreParams(client *gophercloud.ServiceClient, datastoreID, versionID string) pagination.Pager {
 	pageFn := func(r pagination.PageResult) pagination.Page {
 		return ParamPage{pagination.SinglePageBase(r)}
@@ -200,6 +248,11 @@
 	return pagination.NewPager(client, listDSParamsURL(client, datastoreID, versionID), pageFn)
 }
 
+// GetDatastoreParam will retrieve information about a specific configuration
+// parameter. For example, you can use this operation to understand more about
+// "innodb_file_per_table" configuration param for MySQL datastores. You will
+// need the param's ID first, which can be attained by using the ListDatastoreParams
+// operation.
 func GetDatastoreParam(client *gophercloud.ServiceClient, datastoreID, versionID, paramID string) ParamResult {
 	var res ParamResult
 
@@ -211,6 +264,8 @@
 	return res
 }
 
+// ListGlobalParams is similar to ListDatastoreParams but does not require a
+// DatastoreID.
 func ListGlobalParams(client *gophercloud.ServiceClient, versionID string) pagination.Pager {
 	pageFn := func(r pagination.PageResult) pagination.Page {
 		return ParamPage{pagination.SinglePageBase(r)}
@@ -218,6 +273,8 @@
 	return pagination.NewPager(client, listGlobalParamsURL(client, versionID), pageFn)
 }
 
+// GetGlobalParam is similar to GetDatastoreParam but does not require a
+// DatastoreID.
 func GetGlobalParam(client *gophercloud.ServiceClient, versionID, paramID string) ParamResult {
 	var res ParamResult