docs(ios): Add CrashRecoveryBehavior preference docs (#1440)

Author: dpogue

www/docs/en/dev/config_ref/index.md

@@ -332,6 +332,7 @@ AppendUserAgent<br/>{% cdv_vartype string %} {% cdv_platform android %} {% cdv_p
 AutoHideSplashScreen<br/> {% cdv_vartype boolean %} {% cdv_platform android %} {% cdv_platform ios %} | *Default: true* <br/> Indicates whether to hide splash screen automatically or not. The splash screen is hidden after the amount of time specified in the `SplashScreenDelay` preference.
 BackgroundColor<br/>{% cdv_vartype string %} {% cdv_platform android %} {% cdv_platform ios %} | Sets the app's background color. Supports a four-byte hex value, with the first byte representing the alpha channel, and standard RGB values for the following three bytes.
 CordovaWebViewEngine<br/>{% cdv_vartype string %} {% cdv_platform ios %} | *Default: CDVWebViewEngine* <br/>  This sets the WebView engine plugin to be used to render the host app. The plugin must conform to the CDVWebViewEngineProtocol protocol. The 'value' here should match the 'feature' name of the WebView engine plugin that is installed. This preference usually would be set by the WebView engine plugin that is installed, automatically.
+CrashRecoveryBehavior<br/>{% cdv_vartype string %} {% cdv_platform ios %} | *Default: refresh* <br/> Allowed values: refresh, reload <br/> Specifies the crash recovery behavior for the iOS web view. The `reload` option will cause the web view to reload the starting URL for the app, whereas `refresh` will attempt to restore the current URL state.
 DefaultVolumeStream<br/>{% cdv_vartype string %} {% cdv_platform android %} | *Default: default* <br/>  Added in cordova-android 3.7.0, This preference sets which volume the hardware volume buttons link to. By default this is "call" for phones and "media" for tablets. Set this to "media" to have your app's volume buttons always change the media volume. Note that when using Cordova's media plugin, the volume buttons will dynamically change to controlling the media volume when any Media objects are active.
 DisallowOverscroll<br/>{% cdv_vartype boolean %} {% cdv_platform ios %} {% cdv_platform android %} | *Default: false* <br/>  Set to **true** if you don't want the interface to display any feedback when users scroll past the beginning or end of content. On iOS, overscroll gestures cause content to bounce back to its original position. on Android, they produce a more subtle glowing effect along the top or bottom edge of the content. <br/>
 EnableViewportScale<br/>{% cdv_vartype boolean %} {% cdv_platform ios %} | *Default: false* <br/>   Set to true to allow a viewport meta tag to either disable or restrict the range of user scaling, which is enabled by default. Place a viewport such as the following in the HTML to disable scaling and fit content flexibly within the rendering WebView: <br/> ```<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no' />```