📝 Add docstrings to fix/452-web-radio-host-fallback

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Docstrings generation was requested by @InstaZDLL.

• fix(web-radio): try the round-robin host, and retry, before failing #455 (comment)

The following files were modified:

• src-tauri/crates/core/src/plugin/host_impl.rs
• src-tauri/plugins/web-radio/src/lib.rs

These file types are not supported

• src-tauri/crates/core/tests/fixtures/web-radio/manifest.toml
• src-tauri/plugins/web-radio/Cargo.toml
• src-tauri/plugins/web-radio/manifest.toml
• src-tauri/resources/plugins/web-radio/manifest.toml

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