Update index.mdx (#6326)

#### Fix
Added the mention of "store" amongst the tasks that the data connection
module can perform aside from the existing 3 (load, transform and
query). Particularly, this implies the generation of embeddings vectors
and the creation of vector stores.

Author: dataprofessor

docs/docs_skeleton/docs/modules/data_connection/index.mdx

@@ -5,7 +5,7 @@ sidebar_position: 1
 # Data connection
 
 Many LLM applications require user-specific data that is not part of the model's training set. LangChain gives you the 
-building blocks to load, transform, and query your data via:
+building blocks to load, transform, store and query your data via:
 
 - [Document loaders](/docs/modules/data_connection/document_loaders/): Load documents from many different sources
 - [Document transformers](/docs/modules/data_connection/document_transformers/): Split documents, drop redundant documents, and more