Update multiprocessing.rst

Author: rajveer43

Doc/library/multiprocessing.rst

@@ -1052,24 +1052,42 @@ Miscellaneous
    Return a context object which has the same attributes as the
    :mod:`multiprocessing` module.
 
-   If *method* is ``None`` then the default context is returned.
-   Otherwise *method* should be ``'fork'``, ``'spawn'``,
-   ``'forkserver'``.  :exc:`ValueError` is raised if the specified
-   start method is not available.  See :ref:`multiprocessing-start-methods`.
+   If *method* is ``None``, then the default context is returned. 
+   This method sets the default context globally, which may affect 
+   future usage of :func:`set_start_method`. If you wish to change the 
+   method later, it is recommended to explicitly specify a method other 
+   than ``None`` when calling this function. Otherwise, unexpected behavior 
+   may occur. 
+
+   *method* should be one of the following: 
+   ``'fork'``, ``'spawn'``, or ``'forkserver'``. 
+   :exc:`ValueError` is raised if the specified start 
+   method is not available. See :ref:`multiprocessing-start-methods`.
 
    .. versionadded:: 3.4
 
 .. function:: get_start_method(allow_none=False)
 
-   Return the name of start method used for starting processes.
+   Return the name of the start method used for starting processes.
 
-   If the start method has not been fixed and *allow_none* is false,
-   then the start method is fixed to the default and the name is
-   returned.  If the start method has not been fixed and *allow_none*
-   is true then ``None`` is returned.
+   If the start method has not been explicitly set 
+   (e.g., using :func:`set_start_method`) and *allow_none* is false, 
+   then the start method is fixed to the default and the name of the 
+   default method is returned. If the start method has not been explicitly 
+   set and *allow_none* is true, then ``None`` is returned, indicating that 
+   the method has not been explicitly set.
 
-   The return value can be ``'fork'``, ``'spawn'``, ``'forkserver'``
-   or ``None``.  See :ref:`multiprocessing-start-methods`.
+   The return value can be one of the following: 
+   ``'fork'``, ``'spawn'``, ``'forkserver'``, or ``None``. 
+
+   .. note:: Changing the start method using ``multiprocessing.set_start_method``
+      after using ``multiprocessing.get_start_method`` with *allow_none* set to ``False``
+      may raise a ``RuntimeError``. Be cautious when changing the start method 
+      after it has been set.
+
+   See 
+   :ref:`multiprocessing-start-methods` for more information on multiprocessing start 
+   methods and their implications.
 
 .. versionchanged:: 3.8