fix: issue #6813 (Zero-based lists are broken) (#6852)

changelog_unreleased/markdown/pr-6852.md

@@ -0,0 +1,19 @@
+#### Handle zero-based lists correctly ([#6852](https://github.com/prettier/prettier/pull/6852) by [@evilebottnawi](https://github.com/evilebottnawi))
+
+<!-- prettier-ignore -->
+```md
+<!-- Input -->
+0. List
+1. List
+2. List
+
+<!-- Prettier stable -->
+0. List
+1. List
+1. List
+
+<!-- Prettier master -->
+0. List
+1. List
+2. List
+```