fix reference to "undefined" in RFC6570#5205

karenetheridge wants to merge 1 commit intoOAI:v3.3-devOAI/OpenAPI-Specification:v3.3-devfrom

karenetheridge:ether/3.3-rfc-undefinedkarenetheridge/OpenAPI-Specification:ether/3.3-rfc-undefinedCopy head branch name to clipboard