I could be convinced either way here, and Georg & Raymond always have 
excellent judgement.

My personal inclination would probably be to add the documentation for 
assertTrue() and also assertFalse(), since their naming is symmetrical 
with that of assertEqual() etc.  I think plenty of people are using 
those functions anyway, judging by emails I receive, and I'm not sure 
that leaving the function undocumented addresses the issue of the 
(admittedly) sprawling API.

(I think Fred Drake put together the documentation originally; I don't 
recall any particular discussion about which aliases to document and 
which to leave out.)

-Steve