Dot(.) in design while enabling Flipboard RSS

When I enable Flipboard RSS in my website. I found the dot (.) appears in content area, which looks lewd while working on views, content editing and other work from admin.

Implemented hook_help is printing this dot in content area. Don't know why the hook miss-behaving.

/**
 * Implements hook_help().
 */
function flipboardrss_help($path, $arg) {
  return '<p>' . t('.') . '</p>';
}

Attached are the screenshot for the reference.