docs: add missing space in footer

Author: mrholek

packages/docs/src/components/Footer.tsx

@@ -40,7 +40,7 @@ const Footer: FC = () => {
           <a href="https://creativecommons.org/licenses/by/3.0/" target="_blank" rel="noreferrer">
             CC BY 3.0
           </a>
-          .
+          .{' '}
           <strong>
             CoreUI PRO requires a{' '}
             <a href="https://coreui.io/pricing/?framework=react&docs=footer">commercial license</a>.