DOC: cleanup docstring for read_json and fix error in contribution guide
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

- Contribution Guide
    - fix incorrect paths to doc folder
- read_json()
    - add period to end of sentences
    - conform parameter types to project standard
    - add newlines for readability and consistency
    - for convert_dates parameter, fix typos and malformed description and add list as accepted type
    - make Returns section conform to project standard
cc @datapythonista  * New changes to read_json docstring in `a92642d`:
    * Remove colon after `default` for `path_or_buf` parameter
    * Add default value for `orient` parameter (addresses hanging comma, see comment above)
    * Fix error on `typ` parameter by adding set of accepted values and a description
    * Fix error in Returns section by moving description to second line (see comment above)
    * Fix error in See Also section by adding description to DataFrame.to_json (see comment above)
    * Add Series.to_json to See Also section Issue has been opened. #27308 

And the fixes to the type hints have been made. can you merge master Done. Thanks @mpmoran!