Restructure the Solution for 'Army of Functions' task and Fix Typos

Fix #2068 - Army of Functions
Fix #2070 - Typo
Fix #2056 - Grammatical Error
Fix #2074 - Remove semi-colon after function declaration

1-js/02-first-steps/08-operators/4-fix-prompt/solution.md

@@ -9,7 +9,8 @@ let b = "2"; // prompt("Second number?", 2);
 alert(a + b); // 12
 ```
 
-What we should to is to convert strings to numbers before `+`. For example, using `Number()` or prepending them with `+`.
+What we should do is to convert strings to numbers before `+`. For example, using `Number()` or
+prepending them with `+`.
 
 For example, right before `prompt`:
 

1-js/02-first-steps/13-while-for/6-repeat-until-correct/solution.md

@@ -10,6 +10,6 @@ do {
 The loop `do..while` repeats while both checks are truthy:
 
 1. The check for `num <= 100` -- that is, the entered value is still not greater than `100`.
-2. The check `&& num` is false when `num` is `null` or a empty string. Then the `while` loop stops too.
+2. The check `&& num` is false when `num` is `null` or an empty string. Then the `while` loop stops too.
 
 P.S. If `num` is `null` then `num <= 100` is `true`, so without the 2nd check the loop wouldn't stop if the user clicks CANCEL. Both checks are required.