chore: updating docstrings (#204)

* chore: updating docstrings

Author: jackwotherspoon

google/cloud/sql/connector/refresh_utils.py

@@ -40,7 +40,7 @@ async def _get_metadata(
     authority of the Cloud SQL Instance.
 
     :type credentials: google.oauth2.service_account.Credentials
-    :param service:
+    :param credentials:
         A credentials object created from the google-auth Python library.
         Must have the SQL Admin API scopes. For more info check out
         https://google-auth.readthedocs.io/en/latest/.
@@ -49,8 +49,8 @@ async def _get_metadata(
     :param project:
         A string representing the name of the project.
 
-    :type inst_name: str
-    :param project: A string representing the name of the instance.
+    :type instance: str
+    :param instance: A string representing the name of the instance.
 
     :rtype: Dict[str: Union[Dict, str]]
     :returns: Returns a dictionary containing a dictionary of all IP
@@ -67,8 +67,8 @@ async def _get_metadata(
     ):
         raise TypeError(
             "Arguments must be as follows: "
-            + "service (googleapiclient.discovery.Resource), "
-            + "proj_name (str) and inst_name (str)."
+            + "credentials (google.oauth2.service_account.Credentials), "
+            + "project (str) and instance (str)."
         )
 
     if not credentials.valid:

tests/unit/test_refresh_utils.py

@@ -58,7 +58,7 @@ async def test_get_ephemeral(connect_string: str) -> None:
 @pytest.mark.asyncio
 async def test_get_metadata(connect_string: str) -> None:
     """
-    Test to check whether _get_ephemeral runs without problems given a valid
+    Test to check whether _get_metadata runs without problems given a valid
     connection string.
     """