Fix small typo in search_dsl.rst

Co-authored-by: Seth Michael Larson <seth.larson@elastic.co>

docs/search_dsl.rst

@@ -451,7 +451,7 @@ A simple example is below
 
     s = Search()
     # We're going to match based only on two fields, in this case text and title
-    s = s.query(MoreLikeThis(like=my_text, fields=['text', 'title]))
+    s = s.query(MoreLikeThis(like=my_text, fields=['text', 'title']))
     # You can also exclude fields from the result to make the response quicker in the normal way
     s = s.source(exclude=["text"])
     response = s.execute()