spelling correction

Documentation/Database-Schema.md

@@ -1,7 +1,7 @@
 Database Schema Overview
 ===
 
-This document servers as a brief reference overview of the database.
+This document serves as a brief reference overview of the database.
 
 Note that some of this documentation might be incorrect or out of date.
 If you see any problems, please feel free to open an issue or issue