DOC: Missing examples of from_records.
#### Location of the documentation

`pandas.DataFrame.from_records`: https://pandas.pydata.org/docs/dev/reference/api/pandas.DataFrame.from_records.html

#### Documentation problem

Examples are provided for constructors like `DataFrame.from_dict` but no examples are present for `DataFrame.from_records`, which makes it slightly harder to tell whether it's appropriate for a desired use case.

#### Suggested fix for documentation

Add examples.