Feature request: Add docs for https://github.com/hertz-contrib/obs-opentelemetry/pull/35

[Skyenought]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

• Add docs for feat: https://github.com/hertz-contrib/obs-opentelemetry/pull/35

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Office docs repo: https://github.com/cloudwego/cloudwego.github.io