style: fix comment line breaks (PR feedback)

Co-authored-by: Moritz E. Beber <midnighter@posteo.net>

Author: yt-ms

tests/unit/view/test_container_view.py

@@ -18,7 +18,9 @@
 
 
 def test_external_system_boundary_preserved():
- """Test the externalSoftwareSystemBoundariesVisible flag appears in the JSON.
+ """
+ Test the externalSoftwareSystemBoundariesVisible flag appears in the JSON.
+ 
  Not having this set means that Structurizr assumes it is false (see
  https://github.com/Midnighter/structurizr-python/issues/67). When exported
  from Structurizr, the flag is present whether true or false, so check that