media: staging/ipu3-imgu: Address documentation comments

Address comments on the documentation after Yong's original patch.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/media/uapi/v4l/pixfmt-meta-intel-ipu3.rst

@@ -175,4 +175,4 @@ video node in ``V4L2_BUF_TYPE_META_CAPTURE`` format.
 Intel IPU3 ImgU uAPI data types
 ===============================
 
-.. kernel-doc:: include/uapi/linux/intel-ipu3.h
+.. kernel-doc:: drivers/staging/media/ipu3/include/intel-ipu3.h

drivers/staging/media/ipu3/TODO

@@ -21,3 +21,14 @@ staging directory.
   Further clarification on some ambiguities such as data type conversion of
   IEFD CU inputs. (Sakari)
   Move acronyms to doc-rst file. (Mauro)
+
+- Switch to yavta from v4l2n in driver docs.
+
+- Elaborate the functionality of different selection rectangles in driver
+  documentation. This may require driver changes as well.
+
+- More detailed documentation on calculating BDS, GCD etc. sizes needed.
+
+- Document different operation modes, and which buffer queues are relevant
+  in each mode. To process an image, which queues require a buffer an in
+  which ones is it optional?