Edited Unassigned: Stored Procs :: clean up stored proc documentation [1320]

Feature specification ( http://entityframework.codeplex.com/wikipage?title=Code%20First%20Insert%2fUpdate%2fDelete%20Stored%20Procedure%20Mapping )is out of date. We should update it with latest changes. Specifically:
- Name of stored procedure for Many-Many mapping ,
- @RowsAffected is no longer added as output parameter by default, for entities with concurrency tokens (but can be added manually)
- No examples for overriding "Result"