Update _config.yml

editorial change

Author: Michael Byrne

_config.yml

@@ -1,6 +1,6 @@
 #document settings
 title: Open Data Appendix
-description: Office of Management and Budgets
+description: Office of Management and Budget
 url: http://project-open-data.github.com/
 repo_url: https://github.com/project-open-data/project-open-data.github.com