[boost] [fusion] more doc nits

From: David Abrahams (dave_at_[hidden])
Date: 2006-09-19 11:51:27

http://boost-consulting.com/boost/libs/fusion/doc/html/fusion/support/category_of.html

doesn't make it clear which namespace or header the traversal tags can
be found in.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com