[MacPorts] CommitRules renamed

[MacPorts]

Page "CommitRules" was renamed to "CommitMessages" by larryv
Redirect to the renamed page was left behind.

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Page URL: <https://trac.macports.org/wiki/CommitMessages>
MacPorts <https://www.macports.org/>
Ports system for macOS

This is an automated message. Someone added your email address to be
notified of changes on 'CommitRules' page.
If it was not you, please report to admin at macports.org.