DOC: update versionadded string for pandas-gbq

Author: tswast

pandas/core/frame.py

@@ -1174,14 +1174,14 @@ def to_gbq(
                     http://google-auth-oauthlib.readthedocs.io/en/latest/reference/google_auth_oauthlib.flow.html#google_auth_oauthlib.flow.InstalledAppFlow.run_local_server
                 .. [console flow]
                     http://google-auth-oauthlib.readthedocs.io/en/latest/reference/google_auth_oauthlib.flow.html#google_auth_oauthlib.flow.InstalledAppFlow.run_console
-                .. versionadded:: pandas-gbq 0.2.0
+                .. versionadded:: pandas-gbq-0.2.0
             table_schema (list of dicts):
                 List of BigQuery table fields to which according DataFrame
                 columns conform to, e.g. `[{'name': 'col1', 'type':
                 'STRING'},...]`. If schema is not provided, it will be
                 generated according to dtypes of DataFrame columns. See
                 BigQuery API documentation on available names of a field.
-                .. versionadded:: pandas-gbq 0.3.1
+                .. versionadded:: pandas-gbq-0.3.1
 
         See Also
         --------