Add example for Client.purge_from

discord/client.py

@@ -1062,6 +1062,17 @@ class Client:
         HTTPException
             Purging the messages failed.
 
+        Examples
+        ---------
+
+        Deleting bot's messages ::
+
+            def is_me(m):
+                return m.author == client.user
+
+            deleted = await client.purge_from(channel, limit=100, check=is_me)
+            await client.send_message(channel, 'Deleted {} message(s)'.format(len(deleted)))
+
         Returns
         --------
         list