Add un-doumented notes in options

`???` is useless. They should be documented as well as other options.

docs/USING_ADVANCED.md

@@ -48,12 +48,12 @@ console.log(myMarked('I am using __markdown__.'));
 |headerPrefix|`string`  |`''`     |???      |A string to prefix the `id` attribute when emitting headings (h1, h2, h3, etc).|
 |highlight   |`function`|`null`   |???      |A function to highlight code blocks, see <a href="#highlight">Asynchronous highlighting</a>.|
 |langPrefix  |`string`  |`'language-'`|???      |A string to prefix the className in a `<code>` block. Useful for syntax highlighting.|
-|mangle      |`boolean` |`true`   |???      |???     |
+|mangle      |`boolean` |`true`   |???      |If true, autolinked email address is escaped with HTML character references.|
 |pedantic    |`boolean` |`false`  |???      |If true, conform to the original `markdown.pl` as much as possible. Don't fix original markdown bugs or behavior. Turns off and overrides `gfm`.|
 |renderer    |`object`  |`new Renderer()`|???|An object containing functions to render tokens to HTML. See [extensibility](USING_PRO.md) for more details.|
 |sanitize    |`boolean` |`false`  |???      |If true, sanitize the HTML passed into `markdownString` with the `sanitizer` function.|
 |sanitizer   |`function`|`null`   |???      |A function to sanitize the HTML passed into `markdownString`.|
-|silent      |`boolean` |`false`  |???      |???  |
+|silent      |`boolean` |`false`  |???      |If true, the parser does not throw any exception.|
 |smartLists  |`boolean` |`false`  |???      |If true, use smarter list behavior than those found in `markdown.pl`.|
 |smartypants |`boolean` |`false`  |???      |If true, use "smart" typographic punctuation for things like quotes and dashes.|
 |tables      |`boolean` |`true`   |???      |If true and `gfm` is true, use [GFM Tables extension](https://github.github.com/gfm/#tables-extension-).|