Fix internal modules link (xq++, #perl6)

Author: cfa

doc/Language/modules.pod6

@@ -108,7 +108,7 @@ say $class.perl;
 
 C<use> loads and then imports from a compunit at compile time. It will look for
 files that end in C<.pm6> (C<.pm> is also supported, but discouraged). See
-L<here|/language/modules#Finding_modules>
+L<here|/language/modules#Finding_installed_modules>
 for where the runtime will look for modules.
 
 =for code :skip-test