Added new kb article dockmanager-add-content-pane-footer#3283

xristianstefanov merged 2 commits intomastertelerik/blazor-docs:masterfrom

new-kb-dockmanager-add-content-pane-footer-089c0996b6854aa3bf736ab2fe78183ftelerik/blazor-docs:new-kb-dockmanager-add-content-pane-footer-089c0996b6854aa3bf736ab2fe78183fCopy head branch name to clipboard