Document ways to disable remote debugging support

Although PEP 768 mentions how to disable the mechanism of
remote debugging, it is not documented in the Python docs.

This change adds a note on how to disable remote debugging support
in a Python interpreter to the remote debugging how-to and
to the sys.remote_exec docs.

Author: RafaelWO

Doc/howto/remote_debugging.rst

@@ -8,6 +8,13 @@ execute Python code remotely.
 
 Most platforms require elevated privileges to attach to another Python process.
 
+.. note::
+
+   You can disable remote debugging support in a Python interpreter by (1) setting the
+   ``PYTHON_DISABLE_REMOTE_DEBUG`` environment variable to any value before starting
+   the interpreter, (2) using the ``-X disable-remote-debug`` command-line option, or
+   (3) compiling Python with the ``--without-remote-debug`` build flag.
+
 .. _permission-requirements:
 
 Permission requirements
@@ -614,4 +621,3 @@ To inject and execute a Python script in a remote process:
 6. Set ``_PY_EVAL_PLEASE_STOP_BIT`` in the ``eval_breaker`` field.
 7. Resume the process (if suspended). The script will execute at the next safe
    evaluation point.
-

Doc/library/sys.rst

@@ -1997,6 +1997,13 @@ always available. Unless explicitly noted otherwise, all variables are read-only
    interpreter is pre-release (alpha, beta, or release candidate) then the
    local and remote interpreters must be the same exact version.
 
+   .. note::
+
+      You can disable remote debugging support in a Python interpreter by (1) setting the
+      ``PYTHON_DISABLE_REMOTE_DEBUG`` environment variable to any value before starting
+      the interpreter, (2) using the ``-X disable-remote-debug`` command-line option, or
+      (3) compiling Python with the ``--without-remote-debug`` build flag.
+
    .. audit-event:: sys.remote_exec pid script_path
 
       When the code is executed in the remote process, an