Update tutorial/markdown/python/nvidia-nim-llama3-pdf-chat/nvidia-nim-llama3-pdf-chat.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: Arjunnr-cb

tutorial/markdown/python/nvidia-nim-llama3-pdf-chat/nvidia-nim-llama3-pdf-chat.md

@@ -202,7 +202,7 @@ DB_PASSWORD = "<password_for_couchbase_cluster>"
 DB_BUCKET = "<name_of_bucket_to_store_documents>"
 DB_SCOPE = "<name_of_scope_to_store_documents>"
 DB_COLLECTION = "<name_of_collection_to_store_documents>"
-INDEX_NAME = "<name_of_search-vector_index_with_vector_support>"
+INDEX_NAME = "<name_of_search_index_with_vector_support>"
 LOGIN_PASSWORD = "<password to access the streamlit app>"
 ```