DOC: README.md link for issues specified for Docs and good first issue doesn't reference properly

[sivasweatha]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://github.com/pandas-dev/pandas?tab=readme-ov-file#contributing-to-pandas

Documentation problem

In the README.md, the links for 'Docs' and 'good first issue' doesn't reference to the appropriate labels.

Suggested fix for documentation

Change the links so they reference the proper labels.

[sivasweatha]

Fixed this issue with #61836.