libcamera: mediadevice: Improve documentation

Improve the documentation of the media device operation, including how
it handles the lifetime of media objects.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/include/media_device.h

@@ -44,7 +44,7 @@ private:
 
 	std::map<unsigned int, MediaObject *> objects_;
 	MediaObject *object(unsigned int id);
-	bool addObject(MediaObject *obj);
+	bool addObject(MediaObject *object);
 	void clear();
 
 	std::vector<MediaEntity *> entities_;