Merge pull request #832 from KevWright/master

Fixed a typo
Make use of inside-page-reference feature.
Document in-page linking.
Update cheatsheet with inside-current-page shortcut
Fix and/or remove a number of broken links.

Use known link targets from the _reference.md file in the generator
where possible.
Remove broken links and outdated TOC content.
Cleanup more broken link in in-page TOCs
Added troubleshooting to unpublished admin-operate-enterprise
Added unpublished tutorial on file create, modify etc.
Merge branch 'master' of https://github.com/cfengine/documentation