Updated notebook for comprehend moderation (#9875)

### Description
Updated the notebook for comprehend moderation.

cc @baskaryan

docs/docs_skeleton/docs/guides/safety/amazon_comprehend_chain.ipynb

@@ -30,12 +30,7 @@
    "source": [
     "import boto3\n",
     "\n",
-    "comprehend_client = boto3.client('comprehend', \n",
-    "                                 region_name='us-east-1', \n",
-    "                                 aws_access_key_id=\"ASIA6BR6ZDLNQLMEGWHM\",\n",
-    "                                 aws_secret_access_key=\"Y79nefFoOfvgrog6sojSe55xTuKqDJY53BgfrtlG\",\n",
-    "                                 aws_session_token=\"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\"\n",
-    "                                )"
+    "comprehend_client = boto3.client('comprehend', region_name='us-east-1')"
    ]
   },
   {
@@ -389,7 +384,6 @@
     "comp_moderation_with_config = AmazonComprehendModerationChain(\n",
     "        moderation_config=moderation_config, # specify the configuration\n",
     "        client=comprehend_client,            # optionally pass the Boto3 Client\n",
-    "        force_base_exception=True,           # Force BaseModerationError\n",
     "        unique_id='john.doe@email.com',      # A unique ID\n",
     "        moderation_callback=my_callback,     # BaseModerationCallbackHandler\n",
     "        verbose=True\n",