Fix 6.3 branch name

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Update ruby to patchlevel 353 (security update)

https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/
Merge branch 'update_ruby_6_3_stable' of /home/git/repositories/gitlab/gitlabhq into 6-3-stable
minor fix to command
Corrected Typo
Merge pull request #5702 from Wachiwi/patch-1

Corrected Typo
modified css path
Tiny typo
Merge pull request #5761 from gravis/patch-2

Tiny typo
Merge branch '6-3-stable'

Conflicts:
	doc/update/6.2-to-6.3.md
Merge branch 'master' of https://github.com/gitlabhq/gitlabhq