[doc] Fix option_*() migration commands in doc
The function signature in the doc is not the same as in the code. Also option_removed should probably be removed from the doc since the function in migration.py is empty
David Douard <david.douard@logilab.fr> [Wed, 03 May 2017 21:58:48 +0200] rev 12195
[massive store] ensure the cwmassive_initialized table is deleted if needed
This may be necessary if a previous import did badly crached, leaving the
cwmassive_initialized behind.