Update lora_tuning.ipynb (#582)

Update from Keras NLP to Keras Hub

Author: sachinprasadhs

site/en/gemma/docs/core/lora_tuning.ipynb

@@ -319,7 +319,7 @@
         "    instruction=\"What should I do on a trip to Europe?\",\n",
         "    response=\"\",\n",
         ")\n",
-        "sampler = keras_nlp.samplers.TopKSampler(k=5, seed=2)\n",
+        "sampler = keras_hub.samplers.TopKSampler(k=5, seed=2)\n",
         "gemma_lm.compile(sampler=sampler)\n",
         "print(gemma_lm.generate(prompt, max_length=256))"
       ]
@@ -676,7 +676,7 @@
         "    instruction=\"What should I do on a trip to Europe?\",\n",
         "    response=\"\",\n",
         ")\n",
-        "sampler = keras_nlp.samplers.TopKSampler(k=5, seed=2)\n",
+        "sampler = keras_hub.samplers.TopKSampler(k=5, seed=2)\n",
         "gemma_lm.compile(sampler=sampler)\n",
         "print(gemma_lm.generate(prompt, max_length=256))"
       ]