point to authoritative cheatsheet, not a copy

Author: TimToady

doc/Language/faq.pod6

@@ -84,7 +84,7 @@ its L<"Language" section|https://docs.perl6.org/language.html>) as well as
 the L<Resources page|https://perl6.org/resources/>.
 
 There is a cheat sheet at
-L<https://raw.githubusercontent.com/rakudo/star/master/docs/cheatsheet.txt>
+L<https://github.com/perl6/mu/raw/master/docs/Perl6/Cheatsheet/cheatsheet.txt>
 
 Be mindful of publication dates when reading third-party articles. Anything
 published before December, 2015 likely describes pre-release version of Perl 6.