Remove "perl" reference that was missed.

Author: coke

doc/Language/glossary.rakudoc

@@ -937,7 +937,7 @@ C<@array[1][3][5]>.
 
 =head1 X<Sigil|Reference,Sigil>
 
-In Perl, the sigil is the first character of a variable name. It must
+The sigil is the first character of a variable name. It must
 be either $, @, %, or & respectively for a L<C<Scalar>|/type/Scalar>,
 L<C<Array>|/type/Array>, L<C<Hash>|/type/Hash>, or L<C<Code>|/type/Code>
 variable. See also Twigil and role. Also sigiled variables allow short