PaliGemma Code Correction: Model Name & Documentation Link

Typo: Fixed the model name in the code - `paligemma = keras_hub.models.PaliGemmaCausalLM.from_preset("paligemma_3b_mix_224")` from "paligemma_3b_mix_224" to "pali_gemma_3b_mix_224" to correctly laod the model.
Broken Link: Updated the URL for "PaliGemma prompt and system instructions" by replacing the existing URL with the  https://ai.google.dev/gemma/docs/paligemma/prompt-system-instructions/##prompt_task_syntax.

Author: RenuPatelGoogle

site/en/gemma/docs/paligemma/inference-with-keras.ipynb

@@ -260,7 +260,7 @@
       },
       "outputs": [],
       "source": [
-        "paligemma = keras_hub.models.PaliGemmaCausalLM.from_preset(\"paligemma_3b_mix_224\")\n",
+        "paligemma = keras_hub.models.PaliGemmaCausalLM.from_preset(\"pali_gemma_3b_mix_224\")\n",
         "paligemma.summary()"
       ]
     },
@@ -393,7 +393,7 @@
       "source": [
         "## Generate output\n",
         "\n",
-        "After loading the model and creating utility methods, you can prompt the model with image and text data to generate a responses. PaliGemma models are trained with specific prompt syntax for specific tasks, such as `answer`, `caption`, and `detect`. For more information about PaliGemma prompt task syntax, see [PaliGemma prompt and system instructions](https://ai.google.com/gemma/docs/paligemma/prompt-system-instructions##prompt_task_syntax).\n",
+        "After loading the model and creating utility methods, you can prompt the model with image and text data to generate a responses. PaliGemma models are trained with specific prompt syntax for specific tasks, such as `answer`, `caption`, and `detect`. For more information about PaliGemma prompt task syntax, see [PaliGemma prompt and system instructions](https://ai.google.dev/gemma/docs/paligemma/prompt-system-instructions##prompt_task_syntax).\n",
         "\n",
         "Prepare an image for use in a generation prompt by using the following code to load a test image into an object:"
       ]