Correct some minor nits with the 2BSD and 3BSD series of releases

Correct some minor nits with the 2BSD and 3BSD series of releases
based on the information at The Unix Historical Society web page
(http://www.tuhs.org/Unix_History).  Where multiple sources differ,
retain all data.  Prefer 2.79BSD to 2.7.9BSD, since the former is from
/LABEL form the actual release.  Use the /LABEL date as in the TUHS
tables (the curious can read http://minnie.tuhs.org/Unix_History/2bsd
for all the conflicting date confusion if they want).

Approved by:	re@