docs: remove answer_relevancy from llm-docs (#343)

Author: tinomaxthayil

docs/howtos/customisations/llms.ipynb

@@ -292,7 +292,6 @@
    "source": [
     "from ragas.metrics import (\n",
     "    context_precision,\n",
-    "    answer_relevancy,\n",
     "    faithfulness,\n",
     "    context_recall,\n",
     ")\n",
@@ -301,7 +300,6 @@
     "# change the LLM\n",
     "\n",
     "faithfulness.llm = vllm\n",
-    "answer_relevancy.llm = vllm\n",
     "context_precision.llm = vllm\n",
     "context_recall.llm = vllm\n",
     "harmfulness.llm = vllm"