fix resource name in error msgs
diff --git a/openstack/networking/v2/extensions/security/groups/requests.go b/openstack/networking/v2/extensions/security/groups/requests.go
index 3afcf24..3b4bc2f 100644
--- a/openstack/networking/v2/extensions/security/groups/requests.go
+++ b/openstack/networking/v2/extensions/security/groups/requests.go
@@ -92,12 +92,12 @@
 	return res
 }
 
-// IDFromName is a convienience function that returns a securitygroup's ID given its name.
+// IDFromName is a convienience function that returns a security group's ID given its name.
 func IDFromName(client *gophercloud.ServiceClient, name string) (string, error) {
 	securityGroupCount := 0
 	securityGroupID := ""
 	if name == "" {
-		return "", fmt.Errorf("A network name must be provided.")
+		return "", fmt.Errorf("A security group name must be provided.")
 	}
 	pager := List(client, ListOpts{})
 	pager.EachPage(func(page pagination.Page) (bool, error) {
@@ -117,10 +117,10 @@
 
 	switch securityGroupCount {
 	case 0:
-		return "", fmt.Errorf("Unable to find network: %s", name)
+		return "", fmt.Errorf("Unable to find security group: %s", name)
 	case 1:
 		return securityGroupID, nil
 	default:
-		return "", fmt.Errorf("Found %d networks matching %s", securityGroupCount, name)
+		return "", fmt.Errorf("Found %d security groups matching %s", securityGroupCount, name)
 	}
 }