correct name of 6.x-errata

Author: stmuk

doc/Language/faq.pod6

@@ -89,7 +89,7 @@ specification.
 
 Roast's master branch corresponds to the latest development that isn't
 necessarily part of any specification yet. Other branches
-correspond to specific versions; for example, "6c.errata".
+correspond to specific versions; for example, "6.c-errata".
 
 =head2 Is there a glossary of Perl 6 related terms?