Fixed typo in on-prem-release-notes.md#1343

FinnianDempsey wants to merge 1 commit intomastercodefresh-io/docs.codefresh.io:masterfrom

finnd-typo-whatsnew-2.4-flagscodefresh-io/docs.codefresh.io:finnd-typo-whatsnew-2.4-flagsCopy head branch name to clipboard