media: Documentation: Document v4l2-jpeg helper functions

Enable documentation for v4l2-jpeg header related helper functions which
are useful for parsing jpeg files while decoding or creating jpeg headers
while encoding.
Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/driver-api/media/v4l2-core.rst

@@ -26,3 +26,4 @@ Video4Linux devices
     v4l2-tuner
     v4l2-common
     v4l2-tveeprom
+    v4l2-jpeg

Documentation/driver-api/media/v4l2-jpeg.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+V4L2 JPEG header related functions and data structures
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. kernel-doc:: include/media/v4l2-jpeg.h
+   :internal:
+
+.. kernel-doc:: drivers/media/v4l2-core/v4l2-jpeg.c
+   :export: