Add instructions for updating waf lest I get hit by a bus

git-svn-id: svn://localhost/ardour2/branches/3.0@10165 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/doc/updating_waf.txt b/doc/updating_waf.txt
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+Download waf (http://code.google.com/p/waf/)
+Download autowaf (http://svn.drobilla.net/autowaf)
+
+From within the waf source tree, run:
+
+./waf-light -v --make-waf --tools=misc,/path/to/autowaf.py --prelude=''
+cp ./waf /path/to/ardour/3.0/waf