doc: fix package.json "imports" field history

Refs: nodejs#34117

Author: aduh95

doc/api/packages.md

@@ -1118,7 +1118,9 @@ All paths defined in the `"exports"` must be relative file URLs starting with
 
 ### `"imports"`
 <!-- YAML
-added: v14.6.0
+added:
+ - v14.6.0
+ - v12.19.0
 -->
 
 * Type: {Object}