Fix linux camera label rule document

Author: at-wat

pkg/driver/camera/camera.go

@@ -4,10 +4,10 @@ Package camera provides a video camera driver.
 Device Label Generation Rules
 
 On Linux, the device label will be in the format of:
-	/dev/video0;/dev/v4l/by-path/pci-0000:00:00.0-usb-0:0:0.0-video-index0
+	pci-0000:00:00.0-usb-0:0:0.0-video-index0;video0
 If /dev/v4l/by-path/* is not available (for example in a docker container without
 bindings in /dev/v4l/by-path/), it will be:
-	/dev/video0;/dev/video0
+	video0;video0
 */
 package camera