add missing "be" to figure

ch04/01_main-chapter-code/ch04.ipynb

@@ -224,7 +224,7 @@
    "id": "9665e8ab-20ca-4100-b9b9-50d9bdee33be",
    "metadata": {},
    "source": [
-    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/ch04_compressed/04.webp\" width=\"500px\">"
+    "<img src=\"https://sebastianraschka.com/images/LLMs-from-scratch-images/ch04_compressed/04.webp?123\" width=\"500px\">"
    ]
   },
   {