Update release notes

docs/RELEASE-NOTES.md

@@ -190,7 +190,7 @@ References
 
 [Git Release Notes for Drush](https://www.drupal.org/project/grn)
 
-    drush release-notes --nouser 6.0.0-VERSION 6.x
+    drush release-notes --nouser 6.1.0-VERSION 6.1.x
 
 
 6. Tag and create a new release
@@ -198,11 +198,11 @@ References
 
 [Tag a release](https://www.drupal.org/node/1066342)
 
-    git checkout 6.x
+    git checkout 6.1.x
     git up
-    git tag 6.0.0-VERSION
+    git tag 6.1.0-VERSION
     git push --tags
-    git push origin tag 6.0.0-VERSION
+    git push origin tag 6.1.0-VERSION
 
 [Create new release](https://www.drupal.org/node/add/project-release/2640714)