DOC: fix SA05 errors in docstrings for `pandas.plotting.bootstrap_plot` and `pandas.plotting.radviz`
All SA05 Errors resolved in the following cases:

1. scripts/validate_docstrings.py --format=actions --errors=SA05 pandas.plotting.bootstrap_plot
2. scripts/validate_docstrings.py --format=actions --errors=SA05 pandas.plotting.radviz
3. try to fix a `RT03    Return value has no description` in pandas.plotting.radviz



- [x]  xref [DOC: fix SA05 errors in docstrings  #57392](https://github.com/pandas-dev/pandas/issues/57392)
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Thanks @ooooo-create 