Update documenting.md

1. Create an issue on the documentation [GitLab](https://labs.etsi.org/rep/ocf/documentation/-/issues) repository;

2. Create a new branch with the **develop** branch as a source;

3. Update the documentation and any relevant parts (ie: the ``index.md`` with new functionalities for the latest version** or if a new test plan is defined, remember to **update the test plan documentation**);

3. Update the documentation and any relevant parts (ie: the ``index.md`` with new functionalities for the latest version or if a new test plan has been defined, remember to *update the test plan documentation*);

4. Check if errors are not being produced by ``mkdocs`` [locally](#getting-started);

5. Commit and push changes to the new branch;

6. Create a merge/pull request;