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phabricator: avoid a stacktrace when command arguments are missing

Authored by mharbison72.

Description

phabricator: avoid a stacktrace when command arguments are missing

Previously, the TypeError wasn't properly converted to a SignatureError when
improper arguments were supplied to the inner function, because the stack depth
is 2 inside the vcrcommand decorator. The __name__ and __doc__ attributes
need to be reassigned to the new wrapper so that the help summary is available.

Differential Revision: https://phab.mercurial-scm.org/D8209