Update upgrade-guide.md (#8444)
Update upgrade-guide.md (#8444)

A minor typo:

does not supports...=> does not support...
quasarframework/quasar,rstoenescu/quasar-framework,quasarframework/quasar,quasarframework/quasar,quasarframework/quasar,rstoenescu/quasar-framework,rstoenescu/quasar-framework