[PATCH] HACKING: More language clean-up

* HACKING: Clean up more language nits.
 s/commit-access/commit access/
 Include missing trailing slash on http://apr.apache.org (slashes are used
sometimes and skipped sometimes, but they *are* part of the real URL).
 Clarify that the key for secure programming is developer understanding,
not necessarily further education.
 Removed 'staked' from 'staked ownership', as it's neither formal nor
complete.
 Additional linguistic tweaks.

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