[Doc] Update 5.0 to 5.1: Recompile assets

Recompiling assets on the update is needed or main menu appearance may not load properly. This has been mentioned on issues #3722 and #3978.

The command has been tested several by users on those issues and by myself.

Thanks for your time and attention.
Fix wrong file versions in update docs
Merge pull request #4385 from Razer6/fix_update_docs_for_master

Fix wrong file versions in update docs (5.2 to 5.3)
Merge pull request #4369 from zeehio/patch-1

[Doc] Update 5.0 to 5.1: Recompile assets
cattr_accessor removed from IssueObserver and MergeRequestObserver but not updated in fixtures
Merge branch 'master' of github.com:jackbot/gitlabhq
Merge pull request #4407 from jackbot/master

Database seeding failing
Show participants on issues, including mentions, and notify email to all participants
Merge pull request #3898 from jacargentina/notifymentioned

Notify email to mentioned users; show participants ala github on issuables
we should not use `console.log` in production code...
Merge pull request #4410 from senny/dont_console_log_in_code

we should not use `console.log` in production code...
Merge branch 'master' into 6-0-dev

Conflicts:
	app/views/projects/issues/show.html.haml
	db/fixtures/development/09_issues.rb
	db/fixtures/development/10_merge_requests.rb