Fix old link and excess line break in 1.2.8

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

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

1-js/02-first-steps/08-operators/article.md

@@ -180,7 +180,7 @@ Parentheses override any precedence, so if we're not satisfied with the default
 
 There are many operators in JavaScript. Every operator has a corresponding precedence number. The one with the larger number executes first. If the precedence is the same, the execution order is from left to right.
 
-Here's an extract from the [precedence table](https://developer.mozilla.org/en/JavaScript/Reference/operators/operator_precedence) (you don't need to remember this, but note that unary operators are higher than corresponding binary ones):
+Here's an extract from the [precedence table](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence) (you don't need to remember this, but note that unary operators are higher than corresponding binary ones):
 
 | Precedence | Name | Sign |
 |------------|------|------|