docs: fix minor typos in image generation description (#32375)

Description:
Fixed minor typos in the `google_imagen.ipynb` integration notebook
related to image generation prompt formatting. No functional changes
were made — just a documentation correction to improve clarity.

Author: ammaryounas339

docs/docs/integrations/tools/google_imagen.ipynb

@@ -25,7 +25,7 @@
     "- [VertexAIImageEditorChat](#image-editing) : Edit an entire uploaded or generated image with a text prompt.\n",
     "- [VertexAIImageCaptioning](#image-captioning) : Get text descriptions of images with visual captioning.\n",
     "- [VertexAIVisualQnAChat](#visual-question-answering-vqa) : Get answers to a question about an image with Visual Question Answering (VQA).\n",
-    "    * NOTE : Currently we support only only single-turn chat for Visual QnA (VQA)"
+    "    * NOTE : Currently we support only single-turn chat for Visual QnA (VQA)"
    ]
   },
   {
@@ -48,11 +48,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Create Image Gentation model Object\n",
+    "# Create Image Generation model Object\n",
     "generator = VertexAIImageGeneratorChat()"
    ]
   },
@@ -140,11 +140,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Create Image Gentation model Object\n",
+    "# Create Image Generation model Object\n",
     "generator = VertexAIImageGeneratorChat()\n",
     "\n",
     "# Provide a text input for image\n",
@@ -244,7 +244,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -268,10 +268,10 @@
     }
    ],
    "source": [
-    "# use image egenarted in Image Generation Section\n",
+    "# use image generated in Image Generation Section\n",
     "img_base64 = generated_image[\"image_url\"][\"url\"]\n",
     "response = model.invoke(img_base64)\n",
-    "print(f\"Generated Cpation : {response}\")\n",
+    "print(f\"Generated Caption : {response}\")\n",
     "\n",
     "# Convert base64 string to Image\n",
     "img = Image.open(\n",