add blank line to make rst format correct

Created by: jmitrevs

Description

Building the documentation locally indicated a need for an extra line to be legal reStructuredText.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• Documentation update

Tests

Ran make html in the docs directory

Checklist

• I have read the guidelines for contributing.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have installed and run pre-commit on the files I edited or added.
• I have added tests that prove my fix is effective or that my feature works.