Give poplib.POP3.rpop a proper docstring (#127370)

Previously `poplib.POP3.rpop` had a "Not sure what this does" docstring, now it has been fixed.

Author: StanFromIreland

Lib/poplib.py

@@ -309,7 +309,7 @@ def close(self):
     # optional commands:
 
     def rpop(self, user):
-        """Not sure what this does."""
+        """Send RPOP command to access the mailbox with an alternate user."""
         return self._shortcmd('RPOP %s' % user)