[DOCS] Remove extra word from data stream docs

Author: jrodewig

docs/reference/data-streams/data-streams.asciidoc

@@ -17,7 +17,6 @@ longer needed, reducing overhead and storage costs.
 A data stream is designed to give you the best of both worlds:
 
 * The simplicity of a single, named resource you can use for requests
-  related
 * The storage, scalability, and cost-saving benefits of multiple indices
 
 You can submit indexing and search requests directly to a data stream. The