Use code block for df command in storage callout

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: kylemclaren

src/content/docs/working-with-sprites.mdx

@@ -155,7 +155,11 @@ sprite exec "cargo install ripgrep"
 They persist across hibernation. No rebuilds needed.
 
 <Callout type="info">
-**Storage space**: Each Sprite has 100 GB of persistent storage. Check usage with `sprite exec "df -h"`.
+**Storage space**: Each Sprite has 100 GB of persistent storage. Check usage with:
+
+```bash
+sprite exec "df -h"
+```
 </Callout>
 
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