Link concrete entry classes into usage docs. (googleapis#5512)

tseaver · web-flow · commit 0503ee7abc56 · 2018-06-20T21:39:02.000-04:00
Closes googleapis#4118. Note that those API docs won't be as useful as they could be without either making '_BaseEntry' public (see googleapis#5511) or going to extra effort to propagate the signature docs for '__init__'.
diff --git a/docs/logging/usage.rst b/docs/logging/usage.rst
@@ -97,6 +97,16 @@ Fetch entries for the default project.
     :end-before: [END client_list_entries_default]
     :dedent: 4
 
+Entries returned by
+:meth:`Client.list_entries <google.cloud.logging.client.Client.list_entries>`
+or
+:meth:`Logger.list_entries <google.cloud.logging.logger.Logger.list_entries>`
+will be instances of one of the following classes:
+
+- :class:`~google.cloud.logging.entries.TextEntry`
+- :class:`~google.cloud.logging.entries.StructEntry`
+- :class:`~google.cloud.logging.entries.ProtobufEntry`
+
 Fetch entries across multiple projects.
 
 .. literalinclude:: snippets.py
