[docs/release_guide.pod] harmonized made-up release dates

Author: Carl Masak

docs/release_guide.pod

@@ -49,7 +49,7 @@ Change the C<VERSION> file in nqp:
 
 Tag NQP by its release month ("YYYY.MM")
 
-  $ git tag -a -m"tag release YYYY.MM" YYYY.MM    # e.g., 2011.10
+  $ git tag -a -m"tag release YYYY.MM" YYYY.MM    # e.g., 2012.12
   $ git push --tags
 
 =item 4.
@@ -58,13 +58,13 @@ Update F<tools/build/NQP_REVISION> in your Rakudo repository to contain
 the tag you just set on NQP.
 
     $ cd ~/git/rakudo
-    $ echo "2011.10" > tools/build/NQP_REVISION
+    $ echo "2012.12" > tools/build/NQP_REVISION
 
 =item 5.
 
 Cut a release tarball (needed for the Rakudo Star release).
 
-    git archive --format=tar 2012.07 | gzip -9 > ~/nqp-2012.07.tar.gz
+    git archive --format=tar 2012.12 | gzip -9 > ~/nqp-2012.12.tar.gz
 
 =item 6.