Updated font and font-weight docs

Fixed broken link to iOS fonts and added detail to font-weight property documenting ability to use numbers for font-weight

Author: Todd Anglin

docs/ui/styling.md

@@ -125,7 +125,11 @@ page.css = "button { color: red }";
 page.css = "button { color: red }";
 ```
 
-After you have set the default CSS for the page, you can add to it using two methods: adding CSS from a string and adding CSS from a file.
+After you have set the default CSS for the page, you can add to it using two methods:
+
+1. Adding CSS from a string
+2. Adding CSS from a file
+
 {% endnativescript %}
 {% angular %}
 ### Component-specific CSS
@@ -506,7 +510,7 @@ This list of properties can be set in CSS or through the style property of each
 | `font-family`         | `fontFamily`          | Sets the font family of the matched view. |
 | `font-size`           | `fontSize`            | Sets the font size of the matched view (only supports device-independent units). |
 | `font-style`          | `fontStyle`           | Sets the font style of the matched view. Possible values: `italic`, `normal`. |
-| `font-weight`         | `fontWeight`          | Sets the font weight of the matched view Possible values: `bold`, `normal`. |
+| `font-weight`         | `fontWeight`          | Sets the font weight of the matched view Possible values: `bold`, `normal` OR `100`,`200`,`300`,`400`,`500`,`600`,`700`,`800`,`900`, where `400` is `normal` and `700` is `bold` |
 | `text-align`          | `textAlignment`       | Sets text alignment in the matched view. Possible values: `left` , `center`, `right`. |
 | `text-decoration`     | `textDecoration`      | Sets the text formatting. Possible values: `none`, `line-through`, `underline`. |
 | `text-transform`      | `textTransform`       | Sets the text transform. Possible values: `none`, `capitalize`, `uppercase`, `lowercase`. |
@@ -552,7 +556,7 @@ The `font-family` property can hold several values. The first supported font in
 
 Platform specifics:
 * Android: The supported fonts depend very much on the system, thus using the generic font-families or [custom-fonts](#custom-fonts) is recommended.
-* iOS: You can check the [supported fonts in iOS 7](https://support.apple.com/en-us/HT202771).
+* iOS: There are more than 30 default fonts available on iOS. You can check the [supported fonts for specific iOS versions and devices](http://iosfonts.com). To use a built-in font, simply specify the font name in the `font-family` property, such as `font-family: "American Typewriter";`. Adjust the font variant using the [`font-weight`](#supported-css-properties) property.
 
 ### Custom fonts
 You can use custom fonts in your app (in .TTF or .OTF format).