Undocument ChainedCred usage by DefaultAzCred & remove friend and private ctor#4447

antkmsft merged 2 commits intoAzure:mainAzure/azure-sdk-for-cpp:mainfrom

antkmsft:chained-token-credential-implantkmsft/azure-sdk-for-cpp:chained-token-credential-implCopy head branch name to clipboard