Merge branch 'jk/cvsimport-does-not-work-with-cvsps3'

Warn people that other tools are more recommendable over
cvsimport+cvsps2 combo when doing a one-shot import, and cvsimport
will not work with cvsps3.

* jk/cvsimport-does-not-work-with-cvsps3:
  git-cvsimport.txt: cvsps-2 is deprecated

diff --cc Documentation/git-cvsimport.txt
Simple merge