fix: settle round 3 checks across packages

tests/test_site_r2_nav.py

@@ -291,7 +291,7 @@ class PlatformShareCards(unittest.TestCase):
     def test_other_pages_keep_their_section_card(self):
         self.assertEqual(sitestarlight.og_image("platforms/index.md", "setup"),
                          f"{sitestarlight.SITE_URL}assets/og/setup.png")
-        # A manufacturer page has its own card since round 3 (6.6); one
+        # A manufacturer page has its own card since round 3 (6.6). One
         # without a rendered card keeps its section's.
         self.assertEqual(sitestarlight.og_image("systems/sony.md", "explore"),
                          f"{sitestarlight.SITE_URL}assets/og/systems/sony.png")