message: Fix code example in backtracking docs
  Fixing code example as using `BACKTRACK` in `GATE` does not require wrapping in function
diff: @@ -32,11 +32,11 @@ the alternatives (in order) instead of trying to choose one using a limited toke
  $.RULE("statement", () => {
  $.OR([
  {
  - GATE: () => $.BACKTRACK($.longRule1),
  + GATE: $.BACKTRACK($.longRule1),
  ALT: () => $.SUBRULE($.longRule1)
  },
  {
  - GATE: () => $.BACKTRACK($.longRule2),
  + GATE: $.BACKTRACK($.longRule2),
  ALT: () => $.SUBRULE($.longRule2)
  }
  ])
  