Update whatsnew to link to profiling module docs

Enable cross-references to the new profiling module documentation and update
the CLI examples to use the current syntax with the attach subcommand. Also
reference profiling.tracing instead of cProfile since that's the new canonical
name.

Author: pablogsal

Doc/whatsnew/3.15.rst

@@ -82,12 +82,12 @@ New features
 :pep:`799`: A dedicated profiling package
 -----------------------------------------
 
-A new :mod:`!profiling` module has been added to organize Python's built-in
+A new :mod:`profiling` module has been added to organize Python's built-in
 profiling tools under a single, coherent namespace. This module contains:
 
-* :mod:`!profiling.tracing`: deterministic function-call tracing (relocated from
+* :mod:`profiling.tracing`: deterministic function-call tracing (relocated from
   :mod:`cProfile`).
-* :mod:`!profiling.sampling`: a new statistical sampling profiler (named Tachyon).
+* :mod:`profiling.sampling`: a new statistical sampling profiler (named Tachyon).
 
 The :mod:`cProfile` module remains as an alias for backwards compatibility.
 The :mod:`profile` module is deprecated and will be removed in Python 3.17.
@@ -103,10 +103,10 @@ Tachyon: High frequency statistical sampling profiler
 -----------------------------------------------------
 
 A new statistical sampling profiler (Tachyon) has been added as
-:mod:`!profiling.sampling`. This profiler enables low-overhead performance analysis of
+:mod:`profiling.sampling`. This profiler enables low-overhead performance analysis of
 running Python processes without requiring code modification or process restart.
 
-Unlike deterministic profilers (:mod:`cProfile` and :mod:`profile`) that instrument
+Unlike deterministic profilers (such as :mod:`profiling.tracing`) that instrument
 every function call, the sampling profiler periodically captures stack traces from
 running processes.  This approach provides virtually zero overhead while achieving
 sampling rates of **up to 1,000,000 Hz**, making it the fastest sampling profiler
@@ -168,6 +168,9 @@ Key features include:
   (``--async-aware``). See which coroutines are consuming time, with options to show only
   running tasks or all tasks including those waiting.
 
+See :mod:`profiling.sampling` for full documentation, including all available
+output formats, profiling modes, and configuration options.
+
 (Contributed by Pablo Galindo and László Kiss Kollár in :gh:`135953` and :gh:`138122`.)