Add dealing with newlines for editor to 5.1-to-6.0

backport of https://github.com/gitlabhq/gitlabhq/commit/2d681c0d1ed14bf23c041aa04fa3e77caceda9a1
Update gemnasium-gitlab-service
Update org-ruby
Consistency: Capitalize hex values of sugested colors
Fix minor spelling error
Fix labels return code
Bump version to 7.2.0.rc1
Merge pull request #7496 from Razer6/captalize_suggested_colors

Consistency: Capitalize hex values of sugested colors
Merge pull request #7493 from Razer6/update_gems_with_errors

Update gems with errors, to prevent 500 errors
Merge pull request #7527 from Razer6/api_labels_return_code

API: Fix labels return code
Add missing elements to webhook doc
Merge pull request #7524 from Razer6/repo_settings_spelling_error

Fix minor spelling error in repo settings page
Merge pull request #7534 from sue445/feature/add_webhook_doc

Add missing elements to webhook doc
Fix color toggle for labels in edit view
Fix env varable style for documentation
Merge pull request #7537 from Razer6/rake_tasks_style

Fix env variable style for documentation
Merge pull request #7438 from bbodenmiller/patch-5

Add dealing with newlines for editor to 5.1-to-6.0
Add 7.1-to-7.2.md update guide
Add 6.0-to-7.2.md guide ahead of 7.2 release
Update omniauth-google-oauth2 gem

Udate doc