DOC: `ref` issues in the contributing.rst file
#### Problem description

Anytime I click on an internal reference link on the [Contributing.rst](https://github.com/pandas-dev/pandas/blob/master/doc/source/development/contributing.rst) file, I expect to be directed somewhere in the internal documentation that explains something about the internal link.

While it generates a `#id39` tag at the end of the link, it doesn't direct me to the page.

I suspect that this is not typical behavior. I just want to make sure this is the case before I post a PR on it.