Fix typo in install docs, closes #3723
Typo fixes
Typo fix closes gitlabhq/gitlabhq/3984
Fixed grammatical error.
Merge pull request #3988 from crazyscience/patch-3

Fixed grammatical error.
Merge pull request #3987 from bbodenmiller/patch-3

Typo fix in database.md closes 3984
Merge pull request #3983 from bbodenmiller/patch-1

Typo fixes in cleanup.md
Merge pull request #3972 from Razer6/master

Fix small typo in install docs, Closes #3723