Added new kb article dropdownlist-add-clear-button#2820

xristianstefanov merged 6 commits intomastertelerik/blazor-docs:masterfrom

new-kb-dropdownlist-add-clear-button-387f7be39f804b18b31066583ec4852btelerik/blazor-docs:new-kb-dropdownlist-add-clear-button-387f7be39f804b18b31066583ec4852bCopy head branch name to clipboard