tests/test-status-inprocess.py.out

docs: prefer `hg diff --from/--to` over `-r`

This patch includes updating away from the broken `hg diff -r
'date(...)'` (see not in previous patch).

Differential Revision: https://phab.mercurial-scm.org/D9555

% creating repo
% add and commit
C test.py
% change
M test.py