Adding missing doc comments for block storage
diff --git a/openstack/blockstorage/v1/apiversions/requests.go b/openstack/blockstorage/v1/apiversions/requests.go
index b3a39f7..79a939c 100644
--- a/openstack/blockstorage/v1/apiversions/requests.go
+++ b/openstack/blockstorage/v1/apiversions/requests.go
@@ -7,7 +7,7 @@
 	"github.com/racker/perigee"
 )
 
-// ListVersions lists all the Cinder API versions available to end-users.
+// List lists all the Cinder API versions available to end-users.
 func List(c *gophercloud.ServiceClient) pagination.Pager {
 	return pagination.NewPager(c, listURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
 		return APIVersionPage{pagination.SinglePageBase(r)}
diff --git a/openstack/blockstorage/v1/apiversions/results.go b/openstack/blockstorage/v1/apiversions/results.go
index eeff132..c4ac157 100644
--- a/openstack/blockstorage/v1/apiversions/results.go
+++ b/openstack/blockstorage/v1/apiversions/results.go
@@ -44,10 +44,12 @@
 	return resp.Versions, nil
 }
 
+// GetResult represents the result of a get operation.
 type GetResult struct {
 	gophercloud.CommonResult
 }
 
+// Extract is a function that accepts a result and extracts an API version resource.
 func (r GetResult) Extract() (*APIVersion, error) {
 	var resp struct {
 		Version *APIVersion `mapstructure:"version"`