Switch out l() syntax to [] in docs (#851)

* Switch out l() syntax to [] in docs

* Using map syntactic sugar as well.

Co-authored-by: gnembon <41132274+gnembon@users.noreply.github.com>

docs/scarpet/language/LoopsAndHigherOrderFunctions.md

@@ -67,7 +67,7 @@ Evaluates expression `expr`, `num` number of times. code>expr receives `_` syste
 
 <pre>
 loop(5, game_tick())  => repeat tick 5 times
-list = l(); loop(5, x = _; loop(5, list += l(x, _) ) ); list
+list = []; loop(5, x = _; loop(5, list += [x, _] ) ); list
   // double loop, produces: [[0, 0], [0, 1], [0, 2], [0, 3], [0, 4], [1, 0], [1, 1], ... , [4, 2], [4, 3], [4, 4]]
 </pre>
 
@@ -75,7 +75,7 @@ In this small example we will search for first 10 primes, apparently including 0
 
 <pre>
 check_prime(n) -> !first( range(2, sqrt(n)+1), !(n % _) );
-primes = l();
+primes = [];
 loop(10000, if(check_prime(_), primes += _ ; if (length(primes) >= 10, break())));
 primes
 // outputs: [0, 1, 2, 3, 5, 7, 11, 13, 17, 19]