Typo fix

Author: sjn

lib/Language/grammars.pod

@@ -212,7 +212,7 @@ as an argument.
 
 To make it clear that the argument is a match object, the example uses C<$/>
 as a parameter name to the action method, though that's just a handy
-convention, notthing intrinsic. C<$match> would have worked too. (Though using
+convention, nothing intrinsic. C<$match> would have worked too. (Though using
 C<$/> does give the advantage of providing C<< $<capture> >>> as a shortcut
 for C<< $/<capture> >>).