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Clarify Nodejs instruction line.

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Reading for content, updating for consistency (and minor changes for emphasis and clarity).

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Update buildkit.md

Edit to paragraph format rather than short lines.

Update hacking.md

Revised edit to link to dev-docs/basics material for talking with CiviCRM developer community.  Thanks, Sean.

Update index.md

Minor edits to the text that make is more consistent from paragraph to paragraph.