Docerina does not support for Ballerina Services - (API Documentation)

[KasunAratthanage]

Description:

Docerina does not support for generateing API documentation for Ballerina services. However while executing a "ballerina doc" command API documentation is generated in HTML format but content of that document is empty for Ballerina services.

Steps to reproduce: Please find the following recreation steps

1. Create a simple Ballerina service.
2. Then insert API documentation annotations for above service.
3. Run "ballerina doc" command.

Output API documentation generated successfully. But content is empty.

Affected Versions:

OS, DB, other environment details and versions:

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