doc: Separate pages into sub directories.

docs/api/browser/auto-updater.md

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+# auto-updater
+
+`auto-updater` module is a simple wrap around the Sparkle framework, it
+provides auto update service for the application.
+
+Before using this module, you should edit the `Info.plist` following
+https://github.com/andymatuschak/Sparkle/wiki.
+
+## Event: will-install-update
+
+* `event` Event
+* `version` String
+* `continueUpdate` Function
+
+This event is emitted when the update is found and going to be installed.
+Calling `event.preventDefault()` would pause it, and you can call
+`continueUpdate` to continue the update.
+
+## Event: ready-for-update-on-quit
+
+* `event` Event
+* `version` String
+* `quitAndUpdate` Function
+
+This event is emitted when user chose to delay the update until the quit.
+Calling `quitAndUpdate()` would quit the application and install the update.
+
+## autoUpdater.setFeedUrl(url)
+
+* `url` String
+
+## autoUpdater.setAutomaticallyChecksForUpdates(flag)
+
+* `flag` Boolean
+
+## autoUpdater.setAutomaticallyDownloadsUpdates(flag)
+
+* `flag` Boolean
+
+## autoUpdater.checkForUpdates()
+
+## autoUpdater.checkForUpdatesInBackground()