doc: don't use mutable default arguments It appears our mutable default arguments checker doesn't find arguments not on the first line of a function definition :( The arguments aren't used, so the default value is irrelevant. I found this when blackening this script in a future commit. Differential Revision: https://phab.mercurial-scm.org/D7445

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#require docutils gettext

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  $ $TESTDIR/check-gendoc zh_TW

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  checking for parse errors