docs(CModal): fix responsive examples

Author: mrholek

packages/docs/content/components/modal.mdx

@@ -890,7 +890,7 @@ Another override is the option to pop up a React modal component that covers the
 export const FullscreenExample = () => {
   const [visible, setVisible] = useState(false)
   const [visibleSm, setVisibleSm] = useState(false)
-  const [visibleMd, setVisibMdSm] = useState(false)
+  const [visibleMd, setVisibleMd] = useState(false)
   const [visibleLg, setVisibleLg] = useState(false)
   const [visibleXL, setVisibleXL] = useState(false)
   const [visibleXXL, setVisibleXXL] = useState(false)
@@ -949,7 +949,7 @@ export const FullscreenExample = () => {
 ```jsx
 const [visible, setVisible] = useState(false)
 const [visibleSm, setVisibleSm] = useState(false)
-const [visibleMd, setVisibMdSm] = useState(false)
+const [visibleMd, setVisibleMd] = useState(false)
 const [visibleLg, setVisibleLg] = useState(false)
 const [visibleXL, setVisibleXL] = useState(false)
 const [visibleXXL, setVisibleXXL] = useState(false)