[DOCS] Fixed missing space (elastic#38305)

Author: avshiav

docs/reference/query-dsl/dis-max-query.asciidoc

@@ -20,7 +20,7 @@ of these DisjunctionMaxQuery's is combined into a BooleanQuery.
 The tie breaker capability allows results that include the same term in
 multiple fields to be judged better than results that include this term
 in only the best of those multiple fields, without confusing this with
-the better case of two different terms in the multiple fields.The
+the better case of two different terms in the multiple fields. The
 default `tie_breaker` is `0.0`.
 
 This query maps to Lucene `DisjunctionMaxQuery`.