docs: document missing permission types (#24660)

docs/api/session.md

@@ -350,8 +350,10 @@ win.webContents.session.setCertificateVerifyProc((request, callback) => {
   * `webContents` [WebContents](web-contents.md) - WebContents requesting the permission.  Please note that if the request comes from a subframe you should use `requestingUrl` to check the request origin.
   * `permission` String - The type of requested permission.
     * `media` -  Request access to media devices such as camera, microphone and speakers.
+    * `mediaKeySystem` - Request access to DRM protected content.
     * `geolocation` - Request access to user's current location.
     * `notifications` - Request notification creation and the ability to display them in the user's system tray.
+    * `midi` - Request MIDI access in the `webmidi` API.
     * `midiSysex` - Request the use of system exclusive messages in the `webmidi` API.
     * `pointerLock` - Request to directly interpret mouse movements as an input method. Click [here](https://developer.mozilla.org/en-US/docs/Web/API/Pointer_Lock_API) to know more.
     * `fullscreen` - Request for the app to enter fullscreen mode.