add comments to exported funcs and fix EndpointErr unit test
diff --git a/openstack/auth_env.go b/openstack/auth_env.go
index 805ca32..41e41e4 100644
--- a/openstack/auth_env.go
+++ b/openstack/auth_env.go
@@ -17,7 +17,7 @@
ErrNoPassword = fmt.Errorf("Environment variable OS_PASSWORD needs to be set.")
)
-// AuthOptions fills out an identity.AuthOptions structure with the settings found on the various OpenStack
+// AuthOptionsFromEnv fills out an identity.AuthOptions structure with the settings found on the various OpenStack
// OS_* environment variables. The following variables provide sources of truth: OS_AUTH_URL, OS_USERNAME,
// OS_PASSWORD, OS_TENANT_ID, and OS_TENANT_NAME. Of these, OS_USERNAME, OS_PASSWORD, and OS_AUTH_URL must
// have settings, or an error will result. OS_TENANT_ID and OS_TENANT_NAME are optional.