Update RELEASE_NOTES.md

Author: emmadesilva

RELEASE_NOTES.md

@@ -13,7 +13,7 @@ This serves two purposes:
 - for new features.
 
 ### Changed
-- for changes in existing functionality.
+- After updating a Tailwind minor version, table headers in Typography `.prose` classes are now centered instead of left-aligned by default. See https://github.com/tailwindlabs/tailwindcss-typography/commit/f520c53470630e3ad4d43e3c2306882d33bf5c52
 
 ### Deprecated
 - for soon-to-be removed features.