docs/55526: Update the branches pic and ascii art for the releng article

[Marc Fonvieille]

Synopsis: Update the branches pic and ascii art for the releng article

Responsible-Changed-From-To: freebsd-doc->blackend
Responsible-Changed-By: blackend
Responsible-Changed-When: Wed Aug 13 15:13:41 PDT 2003
Responsible-Changed-Why: 
I used pic in past so that one is for me.

http://www.freebsd.org/cgi/query-pr.cgi?pr=55526