fix a typo

Author: chienyuanchang

notebooks/analyzer_training.ipynb

@@ -138,7 +138,7 @@
     "    TRAINING_DATA_CONTAINER_NAME = os.getenv(\"TRAINING_DATA_CONTAINER_NAME\")\n",
     "    if not TRAINING_DATA_STORAGE_ACCOUNT_NAME and not training_data_sas_url:\n",
     "        raise ValueError(\n",
-    "            \"Please set either TRAINING_DATA_SAS_URL or both TRAINING_DATA_STORAGE_ACCCOUNT_NAME and TRAINING_DATA_CONTAINER_NAME environment variables.\"\n",
+    "            \"Please set either TRAINING_DATA_SAS_URL or both TRAINING_DATA_STORAGE_ACCOUNT_NAME and TRAINING_DATA_CONTAINER_NAME environment variables.\"\n",
     "        )\n",
     "    from azure.storage.blob import ContainerSasPermissions\n",
     "    # We will need \"Write\" for uploading, modifying, or appending blobs\n",