Fixing typo in param name: values => sources (#28016)

Author: ycombinator

docs/reference/aggregations/bucket/composite-aggregation.asciidoc

@@ -84,7 +84,7 @@ for the aggregation:
 
 ==== Values source
 
-The `values` parameter controls the sources that should be used to build the composite buckets.
+The `sources` parameter controls the sources that should be used to build the composite buckets.
 There are three different types of values source:
 
 ===== Terms