Add docs generation

Author: lidizheng

docs/retry.rst

@@ -4,3 +4,10 @@ Retry
 .. automodule:: google.api_core.retry
   :members:
   :show-inheritance:
+
+Retry in AsyncIO
+----------------
+
+.. automodule:: google.api_core.retry_async
+  :members:
+  :show-inheritance:

google/api_core/retry_async.py

@@ -222,7 +222,7 @@ def with_deadline(self, deadline):
             deadline (float): How long to keep retrying.
 
         Returns:
-            Retry: A new retry instance with the given deadline.
+            AsyncRetry: A new retry instance with the given deadline.
         """
         return AsyncRetry(
             predicate=self._predicate,
@@ -241,7 +241,7 @@ def with_predicate(self, predicate):
                 ``True`` if the given exception is retryable.
 
         Returns:
-            Retry: A new retry instance with the given predicate.
+            AsyncRetry: A new retry instance with the given predicate.
         """
         return AsyncRetry(
             predicate=predicate,
@@ -262,7 +262,7 @@ def with_delay(self, initial=None, maximum=None, multiplier=None):
             multiplier (float): The multiplier applied to the delay.
 
         Returns:
-            Retry: A new retry instance with the given predicate.
+            AsyncRetry: A new retry instance with the given predicate.
         """
         return AsyncRetry(
             predicate=self._predicate,