added howto use for the utility classes (#511)

* added howto use for the utility classes

* Update docs/conceptual/rocDecode-memory-types.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/conceptual/rocDecode-memory-types.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocDecode-bitstream.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocDecode-bitstream.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocDecode-bitstream.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocDecode-bitstream.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocdecode.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocdecode.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update using-rocDecode-ffmpeg.rst

* key frame -> keyframe

* `api` -> ``api``

* must -> need to

* added a sample walkthrough; removed the bitstream reader info; streamlined info

* Update docs/how-to/using-rocDecode-videodecode-sample.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocDecode-videodecode-sample.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update docs/how-to/using-rocdecode.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* Update rocDecode-samples.rst

* Update docs/how-to/using-rocdecode.rst

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>

* updated tables and other minor things

* updated with Leo's suggestion

* Update using-rocDecode-ffmpeg.rst

* added detail to information about the frame buffers

* small changes based on feedback

* updated

---------

Co-authored-by: Leo Paoletti <164940351+lpaoletti@users.noreply.github.com>
Co-authored-by: Lakshmi Kumar <lakshmi.kumar@amd.com>

docs/tutorials/rocDecode-samples.rst

@@ -8,6 +8,8 @@ rocDecode samples
 
 rocDecode samples are available in the `rocDecode GitHub repository <https://github.com/ROCm/rocDecode/tree/develop/samples>`_.
 
+You can find a walkthrough of the ``videodecode.cpp`` sample at :doc:`Understanding the videodecode.cpp sample <../how-to/using-rocDecode-videodecode-sample>`.
+
 All three rocDecode packages, ``rocDecode``, ``rocdecode-dev``, and ``rocdecode-test``, must be installed to use the rocDecode samples.
 
 If you're using a :doc:`package installer <./install/rocDecode-package-install>`, install ``rocdecode``, ``rocdecode-dev``, and ``rocdecode-test``.
@@ -18,7 +20,7 @@ If you're building and installing rocDecode from its :doc:`source code <../insta
 
    python3 rocDecode-setup.py --developer ON
 
-The rocDecode-test package needs to be built and installed as well:
+The ``rocDecode-test`` package needs to be built and installed as well:
 
 .. code:: shell
 
@@ -27,3 +29,4 @@ The rocDecode-test package needs to be built and installed as well:
   ctest -VV
 
 
+