Issue #1592 Improve documentation for mocha in browser.

You can pass the constructor function of your custom reporter in options and mocha will use it.

docs/index.md

@@ -1574,6 +1574,16 @@ mocha.setup({
 });
 ```
 
+Some available options:
+
+```text
+reporter       {string|constructor} -  Reporter** name or constructor.
+ui             {string}             -  Interface name.
+useColors      {boolean}            -  Use color TTY output from reporter?
+```
+
+\*\* Available built in reporters that can be referenced by name [here](#reporters), and recommended reporters for the browser [here](#reporting).
+
 ### Browser-specific Option(s)
 
 The following option(s) _only_ function in a browser context:
@@ -1582,7 +1592,7 @@ The following option(s) _only_ function in a browser context:
 
 ### Reporting
 
-The "HTML" reporter is what you see when running Mocha in the browser. It looks like this:
+The "HTML" reporter is the default reporter when running Mocha in the browser. It looks like this:
 
 ![HTML test reporter](images/reporter-html.png?withoutEnlargement&resize=920,9999){:class="screenshot" lazyload="on"}
 

lib/mocha.js

@@ -70,7 +70,6 @@ exports.Test = require('./test');
  * @param {boolean} [options.asyncOnly] - Force `done` callback or promise?
  * @param {boolean} [options.bail] - Bail after first test failure?
  * @param {boolean} [options.checkLeaks] - Check for global variable leaks?
- * @param {boolean} [options.color] - Color TTY output from reporter?
  * @param {boolean} [options.delay] - Delay root suite execution?
  * @param {boolean} [options.diff] - Show diff on failure?
  * @param {string} [options.fgrep] - Test filter given string.
@@ -83,12 +82,13 @@ exports.Test = require('./test');
  * @param {boolean} [options.inlineDiffs] - Display inline diffs?
  * @param {boolean} [options.invert] - Invert test filter matches?
  * @param {boolean} [options.noHighlighting] - Disable syntax highlighting?
- * @param {string} [options.reporter] - Reporter name.
+ * @param {string|constructor} [options.reporter] - Reporter name or constructor.
  * @param {Object} [options.reporterOption] - Reporter settings object.
  * @param {number} [options.retries] - Number of times to retry failed tests.
  * @param {number} [options.slow] - Slow threshold value.
  * @param {number|string} [options.timeout] - Timeout threshold value.
  * @param {string} [options.ui] - Interface name.
+ * @param {boolean} [options.useColors] - Use color TTY output from reporter?
  */
 function Mocha(options) {
   options = utils.assign({}, mocharc, options || {});