docs: add mobile: stopMediaProjectionRecording uploadTimeout (#601)

New argument uploadTimeout added to mobile: stopMediaProjectionRecording
documentation.

For: appium/appium#18549

README.md

@@ -1012,6 +1012,7 @@ method | string | no | The http multipart upload method name. The 'PUT' one is u
 headers | Map<string, string> | no | Additional headers mapping for multipart http(s) uploads | {'Agent': '007'}
 fileFieldName | string | no | The name of the form field, where the file content BLOB should be stored for http(s) uploads. `file` by default | blob
 formFields | Map<string, string> or Array<Pair> | no | Additional form fields for multipart http(s) uploads. | {'name': 'yolo.mp4'}
+uploadTimeout | number | no | The maximum number of milliseconds to wait until the media file is uploaded to the remote location. 240000 ms by default. | 30000
 
 #### Returned Result