[PATCH] Fix 2.6.0's broken documentation references

[PATCH] Fix 2.6.0's broken documentation references

From: Hans Ulrich Niedermann <linux-kernel@n-dimensional.de>

I've noted that 2.6.0 contains broken references to documentation.

I got sufficiently annoyed chasing doc files in the wrong place
that I wrote a script to check the references to documentation
files.

Some documentation files have moved (e.g.  Documentation/modules.txt to
Documentation/kbuild/modules.txt).  I adapted the references with a script.