[DOCS] Remove unneeded word in EQL docs

docs/reference/eql/eql.asciidoc

@@ -8,7 +8,7 @@
 
 experimental::[]
 
-{eql-ref}/index.html[Event Query Language (EQL)] is a query language used for
+{eql-ref}/index.html[Event Query Language (EQL)] is a query language for
 event-based, time-series data, such as logs.
 
 [discrete]