Added new kb article richtexteditor-set-background-colors#791

DinkoK merged 3 commits intomastertelerik/winforms-docs:masterfrom

new-kb-richtexteditor-set-background-colors-c1672cfdac4b422aa18bb1c1b363c926telerik/winforms-docs:new-kb-richtexteditor-set-background-colors-c1672cfdac4b422aa18bb1c1b363c926Copy head branch name to clipboard