Revert "README.md: Remove portion of 'making changes' section."

This reverts commit 1955c09.

This was part of an attempt to autogenerate RHMAINTAINERS and
CODEOWNERS. However, even after several fixups, it still causes pipeline
failures. Let's revert all of this and try again later.

Signed-off-by: Jiri Benc <jbenc@redhat.com>

Author: Jiri Benc

README.md

@@ -43,8 +43,15 @@ accompanied by a description of the modifications.  In most cases, a simple
 explanation will do (for example, "Update x86 maintainers"), however the
 maintainers may ask for a more detailed write-up.
 
-Changes are only accepted for the owners.yaml file, as the RHMAINTAINERS and
-CODEOWNERS files are generated automatically on-merge.
+Standalone changes are NOT accepted for the RHMAINTAINERS or CODEOWNERS files,
+and changes are only accepted for the owners.yaml file.  Merge requests that
+modify owners.yaml changes must include associated changes to RHMAINTAINERS &
+CODEOWNERS.  These secondary files can be generated using these commands
+executed from the top level of documentation:
+
+```
+	make # requires minimum golang version 1.14
+```
 
 Users making changes must include a "Signed-off-by:" tag on all commits that
 acknowledges the DCO, https://developercertificate.org.