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

diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index f8e7556..20cd99d 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*.