Corrected while() documentation (#400)

* Corrected while() args

Added `expr` to the args of while() in the documentation

* Corrected while() args

Added `expr` to the args of while() in the documentation

* Update docs/scarpet/language/LoopsAndHigherOrderFunctions.md

Co-authored-by: James103 <37945304+James103@users.noreply.github.com>

Co-authored-by: James103 <37945304+James103@users.noreply.github.com>

docs/scarpet/Full.md

@@ -1109,7 +1109,7 @@ for(range(1000000,1100000),check_prime(_))  => 7216
 
 From which we can learn that there is 7216 primes between 1M and 1.1M
 
-### `while(cond, limit)`
+### `while(cond, limit,expr)`
 
 Evaluates expression `expr` repeatedly until condition `cond` becomes false, but not more than `limit` times. 
 Returns the result of the last `expr` evaluation, or `null` if nothing was successful. Both `expr` and `cond` will 

docs/scarpet/language/LoopsAndHigherOrderFunctions.md

@@ -49,7 +49,7 @@ for(range(1000000,1100000),check_prime(_))  => 7216
 
 From which we can learn that there is 7216 primes between 1M and 1.1M
 
-### `while(cond, limit)`
+### `while(cond, limit, expr)`
 
 Evaluates expression `expr` repeatedly until condition `cond` becomes false, but not more than `limit` times. 
 Returns the result of the last `expr` evaluation, or `null` if nothing was successful. Both `expr` and `cond` will 
@@ -145,4 +145,4 @@ it will be used from now on as a new value for the accumulator.
 <pre>
 reduce([1,2,3,4],_a+_,0)  => 10
 reduce([1,2,3,4],_a*_,1)  => 24
-</pre>
+</pre>