Fix typo

Bugzilla/WebService/Util.pm

@@ -169,7 +169,7 @@ a hash to L</filter>, C<0> otherwise.
 
 =head2 validate
 
-This helps in the validation of parameters passed into the WebSerice
+This helps in the validation of parameters passed into the WebService
 methods. Currently it converts listed parameters into an array reference
 if the client only passed a single scalar value. It modifies the parameters
 hash in place so other parameters should be unaltered.