Improved jsdocs

Author: photonstorm

src/math/RoundTo.js

@@ -5,13 +5,30 @@
  */
 
 /**
- * Round a value to a given decimal place.
+ * Round a value to the given precision.
+ * 
+ * For example:
+ * 
+ * ```javascript
+ * RoundTo(123.456, 0) = 123
+ * RoundTo(123.456, 1) = 120
+ * RoundTo(123.456, 2) = 100
+ * ```
+ * 
+ * To round the decimal, i.e. to round to precision, pass in a negative `place`:
+ * 
+ * ```javascript
+ * RoundTo(123.456789, 0) = 123
+ * RoundTo(123.456789, -1) = 123.5
+ * RoundTo(123.456789, -2) = 123.46
+ * RoundTo(123.456789, -3) = 123.457
+ * ```
  *
  * @function Phaser.Math.RoundTo
  * @since 3.0.0
  *
  * @param {number} value - The value to round.
- * @param {integer} [place=0] - The place to round to.
+ * @param {integer} [place=0] - The place to round to. Positive to round the units, negative to round the decimal.
  * @param {integer} [base=10] - The base to round in. Default is 10 for decimal.
  *
  * @return {number} The rounded value.