Includes @TimToady comment as part of the FAQ

We could make it longer, but there's already a link from the answer,
so I guess that's enough. Since all faq seems to go to a single page,
refs #114; it does not even go to a new section. On the other hand, it
closes #1753.

Author: JJ

doc/Language/faq.pod6

@@ -660,6 +660,10 @@ string|/type/Match>.
 
 C<OpaquePointer> is deprecated and has been replaced with C<Pointer>.
 
+=head2 You can have colonpairs in identifiers. What's the justification?
+
+L<Identifiers can include colon pairs, which become part of their name|https://docs.perl6.org/language/syntax#Identifiers>. According to L<Larry Wall's answer to the issue|https://github.com/perl6/doc/issues/1753#issuecomment-362875676>, I<We already had the colon pair mechanism available, so it was a no-brainer to use that to extend any name that needs to be able to quote uniquefying but non-standard characters (or other other information with a unique stringification to such characters)>.
+
 X<|Perl 6 Implementation (FAQ)>
 =head1 Perl 6 Implementation