Add note about npx caching (#6374)
Add note about npx caching (#6374)

* Add note about npx caching and link to #6119

It is necessary to uninstall any version that was previously installed for the typescript flag to work when using npx.

* Use proper casing for TypeScript

Co-Authored-By: TaylorBriggs <0a7208e9c57b34b284d7767af5973c20745e6422@users.noreply.github.com>

jdcrensh/create-react-app,GreenGremlin/create-react-app,facebookincubator/create-react-app,GreenGremlin/create-react-app,GreenGremlin/create-react-app,mangomint/create-react-app,Timer/create-react-app,jdcrensh/create-react-app,GreenGremlin/create-react-app,viankakrisna/create-react-app,mangomint/create-react-app,viankakrisna/create-react-app,ConnectedHomes/create-react-web-app,d3ce1t/create-react-app,jdcrensh/create-react-app,mangomint/create-react-app,Timer/create-react-app,ConnectedHomes/create-react-web-app,Timer/create-react-app,jdcrensh/create-react-app,mangomint/create-react-app,ConnectedHomes/create-react-web-app,Timer/create-react-app,d3ce1t/create-react-app,ConnectedHomes/create-react-web-app,d3ce1t/create-react-app,d3ce1t/create-react-app,facebookincubator/create-react-app,viankakrisna/create-react-app,facebookincubator/create-react-app