releasenotes: allow notes for multiple directives in a single changeset
This problem was caught in
da91e7309daf8ffc51bf3e6f4b2d8a16ef5af95a. This patch just makes sure there is no warning when we
encounter such a case.
Differential Revision: https://phab.mercurial-scm.org/D2254
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.