Add note on capture_output arg to subprocess.run() docstring (GH-98012)

add note on capture_output arg to the docstring
(cherry picked from commit 80b3e32)

Co-authored-by: andrei kulakov <andrei.avk@gmail.com>

Author: miss-islington

Lib/subprocess.py

@@ -464,7 +464,8 @@ def run(*popenargs,
 
     The returned instance will have attributes args, returncode, stdout and
     stderr. By default, stdout and stderr are not captured, and those attributes
-    will be None. Pass stdout=PIPE and/or stderr=PIPE in order to capture them.
+    will be None. Pass stdout=PIPE and/or stderr=PIPE in order to capture them,
+    or pass capture_output=True to capture both.
 
     If check is True and the exit code was non-zero, it raises a
     CalledProcessError. The CalledProcessError object will have the return code