Use "described in" instead of "references by"

Co-authored-by: Matti Schneider <matti@opentermsarchive.org>

decision-records/0001-schema-improvements.md

@@ -30,7 +30,7 @@ There is ambiguity between the audience of the document and the audience of the
   "also known as": [ // Optional
     "..."
   ],
-  "referenced by": { // Optional
+  "described in": { // Optional
     "name": "url"
   }
 }