We can have the following modifications in [adding-support-for-additional-metadata](https://docs.softwareheritage.org/devel/swh-indexer/metadata-workflow.html#adding-support-for-additional-ecosystem-specific-metadata) page:
- `python3 -m swh.indexer.metadata_dictionary MyMapping path/to/input/file` doesn't work. Replace with `swh indexer mapping translate cff path/to/input/file`
- Whenever adding new mappings, it has to be mentioned in the `MAPPING_NAME` variable of the `swh/indexer/storage/__init__.py` file which isn't mentioned in the documentation. (though it didn't throw an error while testing or parsing) and in expected_output of test_cli_mapping_list
- Mentioning a few examples about fields that are not `string_fields`
- Elaborating how `_traslate_dict` function works. For example : it executes functions starting with 'normalize_'
- Mention command : `swh indexer mapping list-terms` to display [Supported CodeMeta terms](https://docs.softwareheritage.org/devel/swh-indexer/metadata-workflow.html#supported-codemeta-terms)
- Add Youtube videos about JSONLD : [JSON-LD Basics](https://www.youtube.com/watch?v=vioCbTo3C-4), [JSON-LD: Core markup](https://www.youtube.com/watch?v=UmvWk_TQ30A), [Compaction and Expansion](https://www.youtube.com/watch?v=Tm3fD89dqRE)