Update docs/api/empty-tiles.md

Co-authored-by: Andrew Jacombs <[email protected]>

docs/api/empty-tiles.md

@@ -80,7 +80,7 @@ Cons:
 Return a error state saying the tile is not found
 
 - ❌ Is a error state
-- ❌ Not always Cached, Browsers/CDN often ignore caching 404
+- ❌ Not always cached: browsers / CDNs often do not cache 404 responses
 
 # References