Add note about defering in quickstart

Author: quirky-bluejay

docs/quickstart.rst

@@ -54,6 +54,11 @@ slash commands just yet. We can do that by adding this code shown here:
     async def _ping(ctx): # Defines a new "context" (ctx) command called "ping."
         await ctx.send(f"Pong! ({client.latency*1000}ms)")
 
+.. note::
+    In this example we responded directly to the interaction, however if you want to delay the response (if you need more than 3 seconds before sending a message)
+    you can defer the response for up to 15 miniuties with :meth:`ctx.defer() <.SlashContext.defer()>`, this displays a "Bot is thinking" message.
+    However do not defer the response if you will be able to respond (send) within three seconds as this will cause a message to flash up
+
 Let's compare some of the major code differences between the prior examples in order
 to explain what's going on here: