bpo-29235: Update document for Profiler's context manager (GH-7331)

Doc/library/profile.rst

@@ -272,6 +272,9 @@ functions:
 
       pr.print_stats()
 
+   .. versionchanged:: 3.8
+      Added context manager support.
+
    .. method:: enable()
 
       Start collecting profiling data.

Doc/whatsnew/3.8.rst

@@ -151,6 +151,8 @@ Changes in the Python API
   ``type.__new__``.  A :exc:`DeprecationWarning` was emitted in Python
   3.6--3.7.  (Contributed by Serhiy Storchaka in :issue:`23722`.)
 
+* The :class:`cProfile.Profile` class can now be used as a context
+  manager. (Contributed by Scott Sanderson in :issue:`29235`.)
 
 CPython bytecode changes
 ------------------------

Misc/NEWS.d/next/Library/2018-05-14-15-01-55.bpo-29235.47Fzwt.rst

-The :class:`cProfile.Profile` class can now be used as a context manager.
-You can profile a block of code by running::
-
-  import cProfile
-  with cProfile.Profile() as profiler:
-      # ... code to be profiled ...
-
-Patch by Scott Sanderson.
+The :class:`cProfile.Profile` class can now be used as a context manager. Patch
+by Scott Sanderson.