nit: fixed a typo in release-notes/v5.6.0.md.
#### <sub><sup><a name="v560-note-4481" href="#v560-note-4481">:link:</a></sup></sub> feature
-* @evanchaoli added `age` colume to `fly workers`, #4481.
+* @evanchaoli added `age` column to `fly workers`, #4481.
#### <sub><sup><a name="v560-note-4314" href="#v560-note-4314">:link:</a></sup></sub> fix
