docs(api.md): add missing docs (#664)

Follow-up to #641 that adds API entries.

Author: aslushnikov

docs/api.md

@@ -374,12 +374,18 @@ Creates a new browser context. It won't share cookies/cache with other browser c
 ### class: BrowserApp
 
 <!-- GEN:toc -->
+- [event: 'close'](#event-close)
 - [browserApp.close()](#browserappclose)
 - [browserApp.connectOptions()](#browserappconnectoptions)
+- [browserApp.kill()](#browserappkill)
 - [browserApp.process()](#browserappprocess)
 - [browserApp.wsEndpoint()](#browserappwsendpoint)
 <!-- GEN:stop -->
 
+#### event: 'close'
+
+Emitted when the browser app closes.
+
 #### browserApp.close()
 - returns: <[Promise]>
 
@@ -393,6 +399,10 @@ Closes the browser gracefully and makes sure the process is terminated.
 
 This options object can be passed to [browserType.connect(options)](#browsertypeconnectoptions) to establish connection to the browser.
 
+#### browserApp.kill()
+
+Kills the browser process.
+
 #### browserApp.process()
 - returns: <?[ChildProcess]> Spawned browser application process.
 
@@ -1785,7 +1795,7 @@ page.removeListener('request', logRequest);
 ```
 
 <!-- GEN:toc -->
-- [event: 'close'](#event-close)
+- [event: 'close'](#event-close-1)
 - [event: 'console'](#event-console)
 - [event: 'dialog'](#event-dialog)
 - [event: 'domcontentloaded'](#event-domcontentloaded)
@@ -3183,7 +3193,7 @@ Contains the URL of the response.
 The [WebSocket] class represents websocket connections in the page.
 
 <!-- GEN:toc -->
-- [event: 'close'](#event-close-1)
+- [event: 'close'](#event-close-2)
 - [event: 'error'](#event-error)
 - [event: 'messageReceived'](#event-messagereceived)
 - [event: 'messageSent'](#event-messagesent)