Make it more clear

Author: samcv

doc/Language/quoting.pod6

@@ -24,8 +24,11 @@ aren't allowed.  In other words, basic C<Q> strings are as literal as
 possible.
 
 Some delimiters are not allowed immediately after C<Q>',
-C<q> or C<qq>, such as L<identifiers|language/syntax#Identifiers>.
-Common ones include C<( )>, C<'> and C<->.
+C<q> or C<qq>. Any characters that are allowed in
+L<identifiers|language/syntax#Identifiers>
+are not allowed to be used. For example, C<'> and C<->.
+In addition, C<( )> is not allowed because that looks
+like a function call.
 
 =for code :allow<B>
 B<Q'>this will not work!B<'>