correct grammat

doc/Type/Signature.pod6

@@ -17,7 +17,7 @@ X<|signature literal (Signature)>
 X<|:() (Signature)>
 =head1 Signature Literals
 
-Signatures appear in parenthesis after subroutine and method names, on
+Signatures appear inside parentheses after subroutine and method names, on
 blocks after a C<< -> >> or C<< <-> >> arrow, as the input to
 L<variable declarators|/language/variables#Variable_Declarators_and_Scope>
 like L<C<my>|/syntax/my>, or as a separate term starting with a colon.