DOC/ENH: Consider adding optional "Raises" section to the docstring style guide
In the panda's [docstring style guide](https://dev.pandas.io/docs/development/contributing_docstring.html#docstring), there's no reference about the "Raises" section.
I do see the "Raises" section appear hear and there in the codebase, and wondered if it appeared in the right order(i.g "Returns" before "Parameters"), when came to realize that there's no explanation about it.

Just want to hear feedback about the idea.