bpo-37390: Add audit event table to documentations (GH-14406)

Also updates some (unreleased) event names to be consistent with the others.
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index ad49d7f..af33879 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -585,7 +585,7 @@
       with Popen(["ifconfig"], stdout=PIPE) as proc:
           log.write(proc.stdout.read())
 
-   .. audit-event:: subprocess.Popen "executable args cwd env"
+   .. audit-event:: subprocess.Popen executable,args,cwd,env subprocess.Popen
 
       Popen and the other functions in this module that use it raise an
       :ref:`auditing event <auditing>` ``subprocess.Popen`` with arguments