fix typo

Author: luizbills

public/about.html

@@ -560,8 +560,8 @@ <h2><a id="math">Functions for Math</a></h2>
 rad2deg(n: number): number
 
 // Returns the rounded value of an number to optional precision.
-// example: round(PI) return 3
-// example: round(PI, 3) return 3.142
+// example: round(PI) returns 3
+// example: round(PI, 3) returns 3.142
 round(value: number, precision = 0): number
 
 // Constrains a number between `min` and `max`.