Martin von Zweigbergk <martinvonz@google.com> [Tue, 09 Jul 2019 10:56:42 -0700] rev 4718
py3: convert _origdoc to sysstr to match __doc__
It's currently stored as bytes by core, so we need to convert it to
match Python's expected type for __doc__. This patch can be dropped if
D6623 gets accepted.