Mention Perl 6, fixes #3216

Author: lizmat

doc/Language/faq.pod6

@@ -12,9 +12,9 @@ X<|Rakudo, Raku and Perl 6 (FAQ)>
 Properly speaking, L<Rakudo|https://rakudo.org/> is an implementation of Raku.
 It's currently the one that's being developed, but there have been other
 implementations in the past and there will likely be others in the future.
-Raku is the definition of the language. When
-talking about the current interpreter, Rakudo and Raku can be used
-interchangeably.
+Raku is the definition of the language. When talking about the current
+interpreter, Rakudo and Raku can be used interchangeably.  "Perl 6" is the
+name that was used for "Raku" before October 2019.
 
 =head2 When was Raku released?