Better wording (review feedback)

Co-authored-by: Karen Etheridge <[email protected]>

Author: handrews

versions/3.1.1.md

@@ -2583,7 +2583,7 @@ The following properties are taken from the JSON Schema specification but their
 
 In addition to the JSON Schema properties comprising the OAS dialect, the Schema Object supports keywords from any other vocabularies, or entirely arbitrary properties.
 
-The OpenAPI Specification's base vocabulary is safe for standard validators to ignore, as indicated by its inclusion in the OAS dialect's [`$vocabulary`](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-00#section-8.1.2) keyword with a value of `false`.
+Validators MAY choose to ignore keywords defined by the OpenAPI Specification's base vocabulary, due to its inclusion in the OAS dialect with a [`$vocabulary`](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-00#section-8.1.2) value of `false`.
 It is comprised of the following keywords:
 
 ##### <a name="baseVocabulary"></a>Fixed Fields