Don't recommend std::bind().

include/pqxx/transactor.hxx

@@ -59,8 +59,7 @@ namespace pqxx
  * to confirm a commit. It all depends on the type of exception.
  *
  * The callback takes no arguments. If you're using lambdas, the easy way to
- * pass arguments is for the lambda to "capture" them from your variables. Or,
- * if you're using functions, you may want to use `std::bind`.
+ * pass arguments is for the lambda to "capture" them from your variables.
  *
  * Once your callback succeeds, it can return a result, and @ref perform will
  * return that result back to you.