fix: use CSS style for img sizing in docs example

Amp-Thread-ID: https://ampcode.com/threads/T-019cf809-1bbe-7158-a32f-d7f240e4c1ce
Co-authored-by: Amp <amp@ampcode.com>

Author: mjcampagna

CUSTOM-EMOJIS.md

@@ -41,7 +41,7 @@ function MyEmojiPicker() {
             Emoji: ({ emoji, ...props }) => (
               <button {...props}>
                 {emoji.url ? (
-                  <img src={emoji.url} alt={emoji.label} width="1em" height="1em" />
+                  <img src={emoji.url} alt={emoji.label} style={{ width: "1em", height: "1em" }} />
                 ) : (
                   emoji.emoji
                 )}