Update docs to match new markdown style guide 2
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Resolve these conflicts or ask someone with write access to this repository to merge it locally.
Created by: cirosantilli
Same as https://github.com/gitlabhq/gitlabhq/pull/6863 but I deleted my fork before merge.
The comparison view may be inaccurate due to merge conflicts.
Resolve these conflicts or ask someone with write access to this repository to merge it locally.