* stable-2.7:
Fix spelling errors in access-control.txt
Access control documentation: Formatting
Access control documentation: Clean up of categories
Access Control Documentation: Explain special and magic refs
Set core plugins to correct revisions for 2.6-rc2
Update developer instructions for cloning the Gerrit project
Fix Windows build
Conflicts:
Documentation/access-control.txt
Change-Id: I1ee212d357f0da6d006c5fef9427a4b7138c7536