Merge pull request #4274 from matrix-org/michaelkaye/update_kernel_dco_link

Update link to kernel.org DCO usage

CONTRIBUTING.rst

@@ -102,7 +102,7 @@ Sign off
 In order to have a concrete record that your contribution is intentional
 and you agree to license it under the same terms as the project's license, we've adopted the
 same lightweight approach that the Linux Kernel
-(https://www.kernel.org/doc/Documentation/SubmittingPatches), Docker
+`submitting patches process <https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin>`_, Docker
 (https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other
 projects use: the DCO (Developer Certificate of Origin:
 http://developercertificate.org/). This is a simple declaration that you wrote

changelog.d/4274.misc

+Update link to kernel DCO guide