bpo-42407: Use possessive appostrophe in multiprocessing doc (GH-23400)

(cherry picked from commit 6edf06b24a9335a2b0d44634a95e4f5ba0d586d9)

Co-authored-by: ArioA <ArioA@users.noreply.github.com>
diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index c9992ee..046ed39 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -98,7 +98,7 @@
   *spawn*
     The parent process starts a fresh python interpreter process.  The
     child process will only inherit those resources necessary to run
-    the process objects :meth:`~Process.run` method.  In particular,
+    the process object's :meth:`~Process.run` method.  In particular,
     unnecessary file descriptors and handles from the parent process
     will not be inherited.  Starting a process using this method is
     rather slow compared to using *fork* or *forkserver*.