Closes #21687: delimiter in Py_SetPath is platform dependent

Doc/c-api/init.rst

@@ -236,7 +236,9 @@ Process-wide parameters
    :c:func:`Py_Initialize`, then :c:func:`Py_GetPath` won't attempt to compute a
    default search path but uses the one provided instead.  This is useful if
    Python is embedded by an application that has full knowledge of the location
-   of all modules.  The path components should be separated by semicolons.
+   of all modules.  The path components should be separated by the platform
+   dependent delimiter character, which is ``':'`` on Unix and Mac OS X, ``';'``
+   on Windows.
 
    This also causes :data:`sys.executable` to be set only to the raw program
    name (see :c:func:`Py_SetProgramName`) and for :data:`sys.prefix` and