Add timeout notice

Author: hypergonial

examples/app_commands/slash_basic.py

@@ -14,8 +14,9 @@
 async def hello(ctx):
     """Say hello to the bot"""  # the command description can be supplied as the docstring
     await ctx.respond(f"Hello {ctx.author}!")
-    # Please note that you MUST use ctx.respond(), ctx.defer(), or any other interaction response
-    # in your slash command code, otherwise the interaction will fail.
+    # Please note that you MUST respond with ctx.respond(), ctx.defer(), or any other
+    # interaction response within 3 seconds in your slash command code, otherwise the
+    # interaction will fail.
 
 
 @bot.slash_command(