Add change requested

Revert change added in the pull request: smartmatch to smart-match

Author: chsanch

doc/Language/operators.pod6

@@ -1779,7 +1779,7 @@ also modify the other.
 X<|smartmatch operator>
 =head2 infix C«~~»
 
-The X<smartmatch operator> aliases the left-hand side to C<$_>, then evaluates
+The X<smart-match operator> aliases the left-hand side to C<$_>, then evaluates
 the right-hand side and calls C<.ACCEPTS($_)> on it. The semantics are left
 to the type of the right-hand side operand.