We have 7.2 now :metal:
Merge branch 'fix_installation_version' into 'master'

Fix installation version, we have 7.2 now

Change the branch name of cloning source to 7.2!! This also needs to be cherry picked to 7.2 stable branch

/cc @JobV @jacobvosmaer @marin

ps: unfortunately, there is mo :metal: gemoji :(

See merge request !174
cleanup installation guide formatting

* Fix some formatting issues
* Make capitalization of titles consistent
* Update image that shows how to select branch
gitlab 7.2 requires gitlab shell 1.9.7
Merge pull request #7577 from bbodenmiller/patch-7

[Documentation] GitLab 7.2 requires GitLab shell 1.9.7
make configuration comment spacing consistent
Merge pull request #7581 from bbodenmiller/patch-9

make configuration comment spacing consistent
Merge pull request #7576 from bbodenmiller/patch-5

[Documentation] cleanup installation guide formatting
unify nginx config files
remove prerelease note from 6.0 to 7.2 guide
clarify which configs should be updated
Merge pull request #7584 from bbodenmiller/patch-9

remove prerelease note from 6.0 to 7.2 guide
Merge pull request #7585 from bbodenmiller/patch-11

clarify which configs should be updated
7.3 started
Remove outdated 6.0 to 7.1 update guide
Merge pull request #7578 from bbodenmiller/patch-8

Unify Nginx files to match as closely as possible