Adding a REMEMBER to update also highlights of new version if it's needed

README.md

@@ -23,7 +23,7 @@ The steps to upgrade documentation are:
 1. Perform the development of functionality on capif code respository.
 2. Create an issue on [Documentation Gitlab](https://labs.etsi.org/rep/ocf/documentation/-/issues)
 3. Create new branch with source from **develop**.
-4. Update documentation.
+4. Update documentation. ***Remember to update index.md with new functionalities for latest version***
 5. Check if all new documentation is ok using **mike** [Checking documentation with local deployment](#checking-documentation-with-local-deployment) section.
 6. Push changes to branch.
 7. Create Merge Request.