Tweak "As an advanced user" FAQ

- zoffixznet/r no longer builds master, but latest release
- mention Z-Script to build master/assist development
- Make `zef`, `p6doc`, and `ecosystem` links to those resources
- Reword the state of rakudo/master (if devs follow normal procedures,
    the only reason it wouldn't be fully functional is due to a bug; original
    text makes it seem master's state is a lot more chaotic)

Author: zoffixznet

doc/Language/faq.pod6

@@ -67,18 +67,23 @@ X<|rakudobrew (FAQ)>
 =head2 As an advanced user I want to track Rakudo development.
 
 An option is to clone L<the repository|https://github.com/rakudo/rakudo> and
-L<build from source|https://github.com/zoffixznet/r#table-of-contents>.
+build it. This will install work in progress which is minimally-tested and
+may contain severe bugs. If you're interesting in contributing to Rakudo
+Perl 6 compiler, you may find
+L<Z-Script helper tool|https://github.com/zoffixznet/z> useful.
 
-This will install work in progress which isn't necessarily fully functional.
 To install the last official monthly release check out the tag visible at
 L<https://raw.githubusercontent.com/rakudo/rakudo/master/VERSION>
+or set up L<a helper command|https://github.com/zoffixznet/r#table-of-contents>
 
 Some users choose to use L<rakudobrew|https://github.com/tadzik/rakudobrew>,
 which allows installation of multiple versions of rakudo. Be sure to L<read its
 documentation|https://github.com/tadzik/rakudobrew#making-new-scripts-available>
 
-In either case you will probably need to also install zef and p6doc from
-the ecosystem.
+In either case you will probably need to also install
+L«C<zef>|https://modules.perl6.org/dist/zef:github» and
+L«C<p6doc>|https://modules.perl6.org/dist/p6doc:github» from the
+L<ecosystem|http://modules.perl6.org/>.
 
 =head2 Where can I find good documentation on Perl 6?