releasenotes: don't abort is there is a bad formatted entry for releasenotes
While producing releasenotes for (4.3::), releasenotes aborts with error because
of some bad formatting of releasenotes in some commits. Instead of aborting,
this adds warning message which will help us in skipping them and telling user
about it.
Differential Revision: https://phab.mercurial-scm.org/D1097
BasedOnStyle: LLVM
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AllowShortFunctionsOnASingleLine: false