annotate doc/README @ 34507:30ae924a9e00

test-push-race: use 'ui.atexit' instead of python's 'atexit'

Callbacks registered with 'atexit' are sometimes not called (like when a
process is killed by the SIGTERM signal). Therefore, this commit replaces it
with 'ui.atexit' which ensures that the callbacks are always called. This also
makes the test compatible with chg.

Test Plan:
Ran the test 'test-push-race.t' with and without the '--chg' option.

Differential Revision: https://phab.mercurial-scm.org/D957

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