v3.1 specification: minor clarifications, markup improvements#4998

miqui merged 2 commits intoOAI:v3.1-devOAI/OpenAPI-Specification:v3.1-devfrom

karenetheridge:ether/v3.1-markup-improvementskarenetheridge/OpenAPI-Specification:ether/v3.1-markup-improvementsCopy head branch name to clipboard