Update query-dsl.asciidoc (#27669)

docs/reference/query-dsl.asciidoc

@@ -4,8 +4,8 @@
 [partintro]
 --
 
-Elasticsearch provides a full Query DSL based on JSON to define queries.
-Think of the Query DSL as an AST of queries, consisting of two types of
+Elasticsearch provides a full Query DSL (Domain Specific Language) based on JSON to define queries.
+Think of the Query DSL as an AST (Abstract Syntax Tree) of queries, consisting of two types of
 clauses:
 
 Leaf query clauses::