Fix AttributeError in examples

examples/converters.py

@@ -28,7 +28,7 @@ async def userinfo(ctx: commands.Context, user: discord.User):
     # and can do the following:
     user_id = user.id
     username = user.name
-    avatar = user.avatar_url
+    avatar = user.avatar.url
     await ctx.send(f'User found: {user_id} -- {username}\n{avatar}')
 
 @userinfo.error

examples/secret.py

@@ -81,7 +81,7 @@ async def emoji(ctx: commands.Context, emoji: discord.PartialEmoji, *roles: disc
     """
 
     # fetch the emoji asset and read it as bytes.
-    emoji_bytes = await emoji.url.read()
+    emoji_bytes = await emoji.read()
 
     # the key parameter here is `roles`, which controls
     # what roles are able to use the emoji.