Can module owners indicate what changes have occurred in their modules since Reference Application 2.3 as these have to be documented as part of the Reference Application 2.4 release process.
The release notes can be updated if the changes can be indicated by a one liner. https://wiki.openmrs.org/display/RES/Release+Notes+2.4
More extensive changes can be documented in JIRA under the appropriate sub-task of RA-1006.
By default, it is assumed that there are no changes needing to be documented, so in this case there is no need to do anything.