Fix link to MR-template and other improvements

doc/development/database_merge_request_checklist.md

 # Merge Request Checklist
 
 When creating a merge request that performs database related changes (schema
-changes, adjusting queries to optimise performance, etc) you should use the
-merge request template called "Database Changes". This template contains a
+changes, adjusting queries to optimize performance, etc) you should use the
+merge request template called "Database changes". This template contains a
 checklist of steps to follow to make sure the changes are up to snuff.
 
 To use the checklist, create a new merge request and click on the "Choose a
-template" dropdown, then click "Database Changes".
+template" dropdown, then click "Database changes".
 
 An example of this checklist can be found at
-https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12463.
+<https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12463>.
 
 The source code of the checklist can be found in at
-https://gitlab.com/gitlab-org/gitlab-ce/blob/master/.gitlab/merge_request_templates/Database%20Changes.md
+<https://gitlab.com/gitlab-org/gitlab-ce/blob/master/.gitlab/merge_request_templates/Database%20changes.md>