List the sections that changed in a given version of an ordinance
get_changed_sections.RdCorresponds to, for example: https://api.municode.com/CodesChangedDocs?jobId=494092&productId=15441
Returns the set of sections (nodes) that were added or amended in the
specified job relative to the preceding version. Useful for tracking
ordinance changes over time; pair with get_version_history() to walk
versions and get_section_html() (with show_changes = TRUE) to retrieve
the redline for each changed node.