Add note about quoted config values
Fix command-line syntax for tracking branches
Remove old remote-tracking syntax
Fix refspec information

Clarify and correct for fetch, pull, and push
Fix typos
Fix grammar
Fix more typos
Restore old branch tracking configuration syntax

Also add explanation about synonymous options

This reverts commit d1ee3be5516a129a5fe424a8b7e48789fcd57d1e.
Merge branch 'fix' into develop

Conflicts:
	essential git.md
Clarify some points (and fix a bit of Markdown syntax)