revset: drop TODO comment about sorting issue of fullreposet
The bootstrapping issue was addressed at the parsing phase and we expect
that fullreposet.__and__() fully complies to the smartset API, in which
'self & other' should return a result set in self's order. See also
90455e7bf543.
revset: document wdir() as an experimental function
Let's resurrect the docstring since our help module can detect the EXPERIMENTAL
tag and display it only if -v is specified.
This patch updates the test added by 015c0d1087a3 since wdir() is now
documented.