19_mono_camera_control.rst link corrected

there was a typo in a link

Author: cafemoloko

docs/source/index.rst

@@ -90,7 +90,7 @@ Now, pick a tutorial or code sample and start utilizing Gen2 capabilities
    samples/16_device_queue_event.rst
    samples/17_video_mobilenet.rst
    samples/18_rgb_encoding_mobilenet.rst
-   samples/19_mono_camera_control docs.rst
+   samples/19_mono_camera_control.rst
    samples/20_color_rotate_warp.rst
    samples/22_1_tiny_yolo_v3_decoding_on_device.rst
    samples/22_2_tiny_yolo_v4_decoding_on_device.rst