[3.13] Doc: cmdline.rst: Include -P and -R in usage (GH-122590) (#122783)

Doc: cmdline.rst: Include -P and -R in usage (GH-122590)

* ``-P``: safe path (https://docs.python.org/3/using/cmdline.htmlGH-cmdoption-P)
* ``-R``: hash randomization (https://docs.python.org/3/using/cmdline.htmlGH-cmdoption-R)
(cherry picked from commit c25898d)

Co-authored-by: Wim Jeantine-Glenn <[email protected]>

Author: miss-islington

Doc/using/cmdline.rst

@@ -24,7 +24,7 @@ Command line
 
 When invoking Python, you may specify any of these options::
 
-    python [-bBdEhiIOqsSuvVWx?] [-c command | -m module-name | script | - ] [args]
+    python [-bBdEhiIOPqRsSuvVWx?] [-c command | -m module-name | script | - ] [args]
 
 The most common use case is, of course, a simple invocation of a script::