DOC: Update read_hdf's acceptable path types
The docstring for `read_hdf` claims it can read from URLs and file-like objects. Neither of these are supported by the underlying `PyTables` library.

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry
