bpo-32699: Improves doc for .pth files in presense of a ._pth file (#5399)

Doc/using/windows.rst

@@ -721,7 +721,7 @@ installation directory.  So, if you had installed Python to
 :file:`C:\\Python\\Lib\\site-packages\\`.
 
 To completely override :data:`sys.path`, create a ``._pth`` file with the same
-name as the DLL (``python36._pth``) or the executable (``python._pth``) and
+name as the DLL (``python37._pth``) or the executable (``python._pth``) and
 specify one line for each path to add to :data:`sys.path`. The file based on the
 DLL name overrides the one based on the executable, which allows paths to be
 restricted for any program loading the runtime if desired.
@@ -734,7 +734,7 @@ Import statements other than to ``site`` are not permitted, and arbitrary code
 cannot be specified.
 
 Note that ``.pth`` files (without leading underscore) will be processed normally
-by the :mod:`site` module.
+by the :mod:`site` module when ``import site`` has been specified.
 
 When no ``._pth`` file is found, this is how :data:`sys.path` is populated on
 Windows:
@@ -796,7 +796,7 @@ following advice will prevent conflicts with other installations:
   environment variables, and also ignore :mod:`site` unless ``import site`` is
   listed.
 
-* If you are loading :file:`python3.dll` or :file:`python36.dll` in your own
+* If you are loading :file:`python3.dll` or :file:`python37.dll` in your own
   executable, explicitly call :c:func:`Py_SetPath` or (at least)
   :c:func:`Py_SetProgramName` before :c:func:`Py_Initialize`.
 
@@ -930,7 +930,7 @@ directly accessed by end-users.
 When extracted, the embedded distribution is (almost) fully isolated from the
 user's system, including environment variables, system registry settings, and
 installed packages. The standard library is included as pre-compiled and
-optimized ``.pyc`` files in a ZIP, and ``python3.dll``, ``python36.dll``,
+optimized ``.pyc`` files in a ZIP, and ``python3.dll``, ``python37.dll``,
 ``python.exe`` and ``pythonw.exe`` are all provided. Tcl/tk (including all
 dependants, such as Idle), pip and the Python documentation are not included.