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Also improve API styleguide

Signed-off-by: Rémy Coutable <remy@rymai.me>

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See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2397#note_13491048

Refactor and rename `restricted_signup_domains` to `domain_whitelist` to better conform to its behavior and newly introduced behavior.

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This reverts commit 13e37a3e.

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This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

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- Fix some syntax/grammar typos
- Link to GFM documentation on newlines
- Be less strict on the alphabetical order styleguide
- You can override the "numbers in headings" rule if you discuss it first
- Do not mention CE in notes if the feature is in both CE and EE

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