docs: update the prettify.js files with new directives

docs: update the prettify.js files with new directives

Procedure that I've used:

1) Copy https://httpd.apache.org/docs/trunk/mod/directives.html
   to a text file.
2) Generate a csv with something like
   cat /tmp/trunk_directives | sort | tr "\n" ","
3) Replace the content of CONFIG_KEYWORDS in prettify.js
   with the list generated in 2)
4) Run the command the MINIFY command to generate prettify.min.js

This commit should hopefully allow a better syntax highlighting
in our docs examples.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1808203 13f79535-47bb-0310-9956-ffa450edef68