Update saved snippet to match description

Snippet would return only 100 results at most, but the example states all.

(cherry picked from commit 31e452568bdbcaca243d3f1239db6d14a69dbdcc)
Signed-off-by: LilSpazJoekp <15524072+LilSpazJoekp@users.noreply.github.com>

asyncpraw/models/listing/mixins/redditor.py

@@ -159,7 +159,7 @@ def saved(
         .. code-block:: python
 
             current_user = await reddit.user.me()
-            async for item in current_user.saved():
+            async for item in current_user.saved(limit=None):
                 print(item.id)
 
         """