DOC: Examples for DataFrame.from_records
This PR adds examples to the documentation for `pandas.DataFrame.from_records`. It also rewords a couple sentences to clarify that the input data can be a sequence of dicts or sequence of tuples (but not a sequence of DataFrames).

- [x] closes #34057
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry