Fix mathematically incorrect statements about empty sets in set documentation#11855

gewarren merged 3 commits intomaindotnet/dotnet-api-docs:mainfrom

copilot/fix-3e334f7d-b35e-46cb-91a1-618a510b0f04dotnet/dotnet-api-docs:copilot/fix-3e334f7d-b35e-46cb-91a1-618a510b0f04Copy head branch name to clipboard