fix usage typo

Author: coke

doc/Language/faq.pod6

@@ -68,7 +68,7 @@ X<|rakudobrew (FAQ)>
 
 An option is to clone L<the repository|https://github.com/rakudo/rakudo> and
 build it. This will install work in progress which is minimally-tested and
-may contain severe bugs. If you're interesting in contributing to Rakudo
+may contain severe bugs. If you're interested in contributing to Rakudo
 Perl 6 compiler, you may find
 L<Z-Script helper tool|https://github.com/zoffixznet/z> useful.