feat: Enhance Posthog SDK documentation methods

[deandreamatias]

💡 Motivation and Context

Solved #88
Used andoid-sdk reference and official docs reference

💚 How did you test it?

I show the preview of docs on my IDE (VS Code)

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[marandaneto]

thanks @deandreamatias