use actual version literal

Author: coke

doc/Language/faq.pod6

@@ -510,7 +510,7 @@ decision. As they (both the language and the implementations) evolve, they
 grow steadily more usable. Depending on your demands on a programming
 language, Perl 6 and its compilers might or might not be ready for you.
 
-That said, version 6c (Christmas 2015) is the first official release of Perl 6
+That said, version 6.c (Christmas 2015) is the first official release of Perl 6
 as a language, along with a validation suite and a compiler that passes it.
 
 =head2 Why should I learn Perl 6? What's so great about it?