api/changes - Clean up formatting under "4.7.0: Global $civicrm_setting"

Update planning.md

With only one example, a reader might misinterpret the example as saying
that `Search Preferences` has been renamed `domain`.  Including two examples
should more clearly indicate that *all* group-names are now flattened to
just `domain`.

This section documents two distinct changes, but they had different
formatting -- which made it seem that (perhaps) the one code-block was
describing both changes.

This change uses similar formatting for both examples and changes the
indentation/alignment to indicate that they're distinct.

Update lifecycle.md

Update publish.md

Update advanced.md

Update troubleshooting.md

Update structure.md

Update index.md

Update release-process.md

Reading for content; editing for consistency. 
Updated per seamuslee001's comment, and I found another missed edit in the automate testing paragraph.

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Update hacking.md

Update jenkins.md

Update civilint.md

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Update cividist.md

Update civibuild.md

Update buildkit.md

Update buildkit.md

Update index.md

Update phpstorm.md

Update skills.md

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Update requirements.md

Update community.md

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Clarify Nodejs instruction line.

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