www-cgi/: Clean up environment filtering doc
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Tue, 17 May 2016 15:25:17 +0000 (16:25 +0100)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Tue, 17 May 2016 15:27:40 +0000 (16:27 +0100)
commitd083b489fb37f322b4896a8f7c449ac4a1ea1f77
tree9e78a1f11c8cc8343b9953df9f1ee94da216ee22
parent2c62631d2ccb51dacc14c75553f134410c0b2b5f
www-cgi/: Clean up environment filtering doc

Reword this a bit so it makes sense as a text doc, and make some minor
formatting changes.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
www-cgi/README.custom-env-filter