chore(core): updated changesets

Author: tgreyuk

.changeset/cold-places-sneeze.md

@@ -0,0 +1,6 @@
+---
+'typedoc-plugin-markdown': patch
+---
+
+- Correctly handle group title in pageTitleTemplates callback (#807).
+- Format of optional type and getter/setter (#804) - thanks @normanzb.