docs/helpwanted: Rewrite this page.

Those old driver TODOs don't have anything useful.  We don't want piglit
coverage just for the sake of piglit, but want increased coverage.  And
better instructions on writing and submitting code are fully
documented elsewhere.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39741>

docs/helpwanted.rst

@@ -4,33 +4,28 @@ Help Wanted
 We can always use more help with the Mesa project. Here are some
 specific ideas and areas where help would be appreciated:
 
-#. **Driver patching and testing.** Patches are often posted to the
-   `mesa-dev mailing
-   list <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`__,
-   but aren't immediately checked into Git because not enough people are
-   testing them. Just applying patches, testing and reporting back is
-   helpful.
+#. **Driver testing.** Most developers are working on newer hardware
+   on the Mesa main branch, but older hardware often doesn't have
+   automated testing or as much testing coverage.  Testing your older
+   hardware for regressions and bisecting and fixing problems in those
+   drivers is useful for other Linux users.  You can also help by
+   doing manual performance (or regression) testing work on performance
+   changes being made in Mesa's open merge requests.
 #. **Driver debugging.** There are plenty of open bugs in the `bug
    database <https://gitlab.freedesktop.org/mesa/mesa/-/issues>`__.
 #. **Remove aliasing warnings.** Enable GCC's
    ``-Wstrict-aliasing=2 -fstrict-aliasing`` arguments, and track down
    aliasing issues in the code.
 #. **Contribute more tests to**
-   `Piglit <https://piglit.freedesktop.org/>`__.
+   `Piglit <https://piglit.freedesktop.org/>`__ that aren't covered by
+   VK-GL-CTS.
 
 You can find some further To-do lists here:
 
 **Common To-Do lists:**
 
 -  `features.txt <https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/docs/features.txt>`__
-   - Status of OpenGL 3.x / 4.x features in Mesa.
-
-**Legacy Driver specific To-Do lists:**
-
--  `r600g <https://dri.freedesktop.org/wiki/R600ToDo>`__ - Driver
-   for ATI/AMD R600 - Northern Island.
--  `r300g <https://dri.freedesktop.org/wiki/R300ToDo>`__ - Driver
-   for ATI R300 - R500.
+   - Status of OpenGL/OpenGLES and Vulkan features in Mesa across drivers.
 
 If you want to do something new in Mesa, first join the Mesa developer's
 mailing list. Then post a message to propose what you want to do, just
@@ -39,9 +34,5 @@ to make sure there's no issues.
 Anyone is welcome to contribute code to the Mesa project. By doing so,
 it's assumed that you agree to the code's licensing terms.
 
-Finally:
-
-#. Try to write high-quality code that follows the existing style.
-#. Use uniform indentation, write comments, use meaningful identifiers,
-   etc.
-#. Test your code thoroughly. Include test programs if appropriate.
+Finally, be sure to review the instructions for :doc:`submitting
+patches <submittingpatches>`.