Update versions/3.1.1.md

Co-authored-by: Ralf Handl <[email protected]>

versions/3.1.1.md

@@ -2762,7 +2762,7 @@ This object MAY be extended with [Specification Extensions](#specification-exten
 
 JSON Schema Draft 2020-12 supports [collecting annotations](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-00#section-7.7.1), including [treating unrecognized keywords as annotations](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-00#section-6.5).
 OAS implementations MAY use such annotations, including [extensions](https://spec.openapis.org/registry/extension/) not recognized as part of a declared JSON Schema vocabulary, as the basis for further validation.
-Note that JSON Schema draft 2020-12 does not require an `x-` prefix for extensions.
+Note that JSON Schema Draft 2020-12 does not require an `x-` prefix for extensions.
 
 ###### Non-validating constraint keywords