Add google.ai.generativelanguage_v1beta3.types to the api-reference (#71)

Author: MarkDaoust

docs/build_docs.py

@@ -147,6 +147,9 @@ def __call__(self, path, parent, children):
             if "ServiceClient" in path[-1] or "ServiceAsyncClient" in path[-1]:
                 children = list(self.drop_staticmethods(parent, children))
 
+        if "generativelanguage" in path[-1]:
+            children.append(('types', glm.types))
+
         return children