Use "Returning Officer" instead of "returns officer"

Author: pradyunsg

peps/pep-0772.rst

@@ -198,9 +198,9 @@ A council election consists of two phases:
 
 Each phase should last two weeks.
 
-The election process is managed by a returns officer nominated by the outgoing
-Packaging Council. For the initial election, the returns officer will be
-nominated by the PSF Executive Director.
+The election process is managed by one Returning Officer nominated by the
+outgoing Packaging Council. For the initial election, the Returning Officer
+will be nominated by the PSF Executive Director.
 
 The PSF shall maintain records of the elections as well as run the annual
 election for the council.