The installation link has changed from /installation/ to /install/. This
commit will update all the remaining links that are missing.

Marcel Amirault authored 5 years ago and Evan Read committed 5 years ago

After review, heading was changed and links to
it needed to be updated, and minor tweaks to
the issues docs such as note formatting

Split into user and administrator docs:

- administration/issue_closing_pattern.md
- user/project/issues/automatic_issue_closing.md

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Due to https://gitlab.com/gitlab-org/gitlab-ce/issues/3349

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

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Issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/12785
Merge Request: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/3514

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