Fix link to class

Author: coke

doc/Language/perl-op.rakudoc

@@ -52,7 +52,7 @@ also used for method calls.  So Perl's C«$arrayref->[7]» becomes
 Raku's C<$arrayref.[7]> and C«$user->name» becomes C<$user.name>.
 Note that dereferencing is rare in Raku.
 
-Raku uses the C<->> to attach L<C<Signatures>|/type/Signature>s to
+Raku uses the C<->> to attach L<C<Signature>|/type/Signature>s to
 L<C<Block>|/type/Block>s.
 
 =head2 Auto-increment and auto-decrement