[3.12] gh-125289: Update sample code in asyncio-task.rst (GH-125292) (GH-125375)

gh-125289: Update sample code in asyncio-task.rst (GH-125292)

* Update sample code in asyncio-task.rst

This will change **coroutines** sample code in the **Awaitables** section and make the example clearer.

* Update Doc/library/asyncio-task.rst

Revert the added print



* Update Doc/library/asyncio-task.rst



---------

(cherry picked from commit fa52b82c91)

Co-authored-by: Ghorban M. Tavakoly <58617996+galmyk@users.noreply.github.com>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>

Doc/library/asyncio-task.rst

@@ -158,7 +158,7 @@ other coroutines::
         # Nothing happens if we just call "nested()".
         # A coroutine object is created but not awaited,
         # so it *won't run at all*.
-        nested()
+        nested()  # will raise a "RuntimeWarning".
 
         # Let's do it differently now and await it:
         print(await nested())  # will print "42".