Minor README.md updates#257

Merged

Potherca merged 1 commit intoplantuml-stdlib:masterfrom

kirchsth:feature/argFix_C4StdLib

Nov 6, 2022

Commits on Nov 5, 2022

minor README.md updates (include via C4 StdLib, fix ?link, add ?arg description, update TOC)
kirchsth
committed