[webkit-dev] Update commit log template to add placeholder for explanation of why a patch fixes a bug

[Michael Catanzaro]

On Thu, Nov 17 2022 at 02:48:04 PM -0800, Ryosuke Niwa 
<rniwa at apple.com> wrote:
> But every change in WebKit comes with a Bugzilla bug.

Certainly most do, but some counterexamples:

 * Unreviewed build fixes sometimes do not reference a bug
 * When fixing a new compiler warning or build failure, I often 
reference the bug that introduced the problem, rather than reporting a 
new one just to have a new hyperlink for the commit message
 * We probably don't need a bug report for stuff like "update my email 
address in contributors.json" or "fix typo in comment"

Anyway, it doesn't matter terribly much what wording we use.

Michael