docs: dev-tools: kunit: avoid using ReST :doc:`foo` markup

The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Reviewed-by: David Gow <[e-mail]>
Acked-by: Brendan Higgins <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/6fde40[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/dev-tools/kunit/faq.rst

···
    modules will automatically execute associated tests when loaded. Test results
    can be collected from ``/sys/kernel/debug/kunit/<test suite>/results``, and
    can be parsed with ``kunit.py parse``. For more details, see "KUnit on
-   non-UML architectures" in :doc:`usage`.
+   non-UML architectures" in Documentation/dev-tools/kunit/usage.rst.
 
 If none of the above tricks help, you are always welcome to email any issues to
 [e-mail].

Documentation/dev-tools/kunit/index.rst

···
 results. This provides a quick way of running KUnit tests during development,
 without requiring a virtual machine or separate hardware.
 
-Get started now: :doc:`start`
+Get started now: Documentation/dev-tools/kunit/start.rst
 
 Why KUnit?
 ==========
···
 How do I use it?
 ================
 
-*   :doc:`start` - for new users of KUnit
-*   :doc:`tips` - for short examples of best practices
-*   :doc:`usage` - for a more detailed explanation of KUnit features
-*   :doc:`api/index` - for the list of KUnit APIs used for testing
-*   :doc:`kunit-tool` - for more information on the kunit_tool helper script
-*   :doc:`faq` - for answers to some common questions about KUnit
+*   Documentation/dev-tools/kunit/start.rst - for new users of KUnit
+*   Documentation/dev-tools/kunit/tips.rst - for short examples of best practices
+*   Documentation/dev-tools/kunit/usage.rst - for a more detailed explanation of KUnit features
+*   Documentation/dev-tools/kunit/api/index.rst - for the list of KUnit APIs used for testing
+*   Documentation/dev-tools/kunit/kunit-tool.rst - for more information on the kunit_tool helper script
+*   Documentation/dev-tools/kunit/faq.rst - for answers to some common questions about KUnit

Documentation/dev-tools/kunit/start.rst

···
 	./tools/testing/kunit/kunit.py run
 
 For more information on this wrapper (also called kunit_tool) check out the
-:doc:`kunit-tool` page.
+Documentation/dev-tools/kunit/kunit-tool.rst page.
 
 Creating a .kunitconfig
 -----------------------
···
 
 Next Steps
 ==========
-*   Check out the :doc:`tips` page for tips on
+*   Check out the Documentation/dev-tools/kunit/tips.rst page for tips on
     writing idiomatic KUnit tests.
 *   Optional: see the :doc:`usage` page for a more
     in-depth explanation of KUnit.

Documentation/dev-tools/kunit/tips.rst

···
 
 
 Note: here we're able to get away with using ``test->priv``, but if you wanted
-something more flexible you could use a named ``kunit_resource``, see :doc:`api/test`.
+something more flexible you could use a named ``kunit_resource``, see
+Documentation/dev-tools/kunit/api/test.rst.
 
 Failing the current test
 ------------------------
···
 
 Next Steps
 ==========
-*   Optional: see the :doc:`usage` page for a more
+*   Optional: see the Documentation/dev-tools/kunit/usage.rst page for a more
     in-depth explanation of KUnit.

Documentation/dev-tools/kunit/usage.rst

···
 some basic knowledge of testing.
 
 For a high level introduction to KUnit, including setting up KUnit for your
-project, see :doc:`start`.
+project, see Documentation/dev-tools/kunit/start.rst.
 
 Organization of this document
 =============================
···
 expectations until the test case ends or is otherwise terminated. This is as
 opposed to *assertions* which are discussed later.
 
-To learn about more expectations supported by KUnit, see :doc:`api/test`.
+To learn about more expectations supported by KUnit, see
+Documentation/dev-tools/kunit/api/test.rst.
 
 .. note::
    A single test case should be pretty short, pretty easy to understand,
···
 after late_init, or when the test module is loaded (depending on whether the
 test was built in or not).
 
-For more information on these types of things see the :doc:`api/test`.
+For more information on these types of things see the
+Documentation/dev-tools/kunit/api/test.rst.
 
 Common Patterns
 ===============