Added new kb article treeview-disable-checkboxes#2838

Tsvetomir-Hr merged 2 commits intomastertelerik/blazor-docs:masterfrom

new-kb-treeview-disable-checkboxes-efbfdad54ae94133a22b09e932683628telerik/blazor-docs:new-kb-treeview-disable-checkboxes-efbfdad54ae94133a22b09e932683628Copy head branch name to clipboard