fix: Update https://github.com/hotosm/raw-data-api/blob/develop/docs/src/api/API/index.md. fix broken links to files leading to 404 error

[nwekealex65]

The file https://github.com/hotosm/raw-data-api/blob/develop/docs/src/api/API/index.md provides links to submodules which are broken and leads to a 404 error.

[nwekealex65]

@petya-kangalova @kshitijrajsharma this PR resolves the issue nwekealex65#7. Review and give a feedback. Thanks