Update date-picker-aria.md

Author: TheSonOfThomp

.changeset/date-picker-aria.md

@@ -2,5 +2,6 @@
 '@leafygreen-ui/date-picker': patch
 ---
 
+[LG-3879](https://jira.mongodb.org/browse/LG-3879)
 Updates ARIA labels for DatePicker menu previous/next buttons, and year/month select elements.
 Hides calendar cell text, so screen-readers only read the cell's `aria-value`.