Document restrictions on fuzzy matching when using synonyms (#40783)

Relates to #25518 #41592

docs/reference/query-dsl/match-query.asciidoc

@@ -56,8 +56,9 @@ rewritten.
 Fuzzy transpositions (`ab` -> `ba`) are allowed by default but can be disabled
 by setting `fuzzy_transpositions` to `false`.
 
-Here is an example when providing additional parameters (note the slight
-change in structure, `message` is the field name):
+Note that fuzzy matching is not applied to terms with synonyms, as under the hood
+these terms are expanded to a special synonym query that blends term frequencies,
+which does not support fuzzy expansion.
 
 [source,js]
 --------------------------------------------------