docs: dt: submitting-patches: drop outdated points to TXT format

New bindings in TXT format are not accepted and DT schema format expects
all compatibles to be explicitly defined, thus guidance about "wildcard
<chip>" is not correct anymore.  Drop that paragraph and update one more
place which still mentions TXT files.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240108083750.16350-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/submitting-patches.rst

@@ -42,28 +42,18 @@ I. For patch submitters
      the code implementing the binding.
 
   6) Any compatible strings used in a chip or board DTS file must be
-     previously documented in the corresponding DT binding text file
+     previously documented in the corresponding DT binding file
      in Documentation/devicetree/bindings.  This rule applies even if
      the Linux device driver does not yet match on the compatible
      string.  [ checkpatch will emit warnings if this step is not
      followed as of commit bff5da4335256513497cc8c79f9a9d1665e09864
      ("checkpatch: add DT compatible string documentation checks"). ]
 
-  7) The wildcard "<chip>" may be used in compatible strings, as in
-     the following example:
-
-         - compatible: Must contain '"nvidia,<chip>-pcie",
-           "nvidia,tegra20-pcie"' where <chip> is tegra30, tegra132, ...
-
-     As in the above example, the known values of "<chip>" should be
-     documented if it is used.
-
-  8) If a documented compatible string is not yet matched by the
+  7) If a documented compatible string is not yet matched by the
      driver, the documentation should also include a compatible
-     string that is matched by the driver (as in the "nvidia,tegra20-pcie"
-     example above).
+     string that is matched by the driver.
 
-  9) Bindings are actively used by multiple projects other than the Linux
+  8) Bindings are actively used by multiple projects other than the Linux
      Kernel, extra care and consideration may need to be taken when making changes
      to existing bindings.