docs: quote extras install commands in package README#1602

stablegenius49 wants to merge 1 commit intomicrosoft:mainmicrosoft/markitdown:mainfrom

stablegenius49:pr-factory/issue-1574-pypi-install-quotesstablegenius49/markitdown:pr-factory/issue-1574-pypi-install-quotesCopy head branch name to clipboard