Add changelog entries

Author: SBGoods

.changes/unreleased/BUG FIXES-20241022-163805.yaml

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+kind: BUG FIXES
+body: 'validate: File extension check now runs on `index.*` files instead of just `index.md` files.'
+time: 2024-10-22T16:38:05.530944-04:00
+custom:
+    Issue: "413"

.changes/unreleased/BUG FIXES-20241022-164013.yaml

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+kind: BUG FIXES
+body: 'validate: File extension check now specifies the correct valid extensions in the error message.'
+time: 2024-10-22T16:40:13.832638-04:00
+custom:
+    Issue: "413"

.changes/unreleased/BUG FIXES-20241022-164107.yaml

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+kind: BUG FIXES
+body: 'validate: Front matter check now runs with the correct options on legacy index files.'
+time: 2024-10-22T16:41:07.726856-04:00
+custom:
+    Issue: "413"