[ES|QL] Change function_named_parameters in Kibana doc to expected format (elastic#121585)

* change function_named_parameters in kibana doc to expected format

Author: fang-xing-esql

docs/reference/esql/functions/kibana/definition/kql.json

@@ -251,7 +251,7 @@ public Match(
                     valueHint = { "none", "all" },
                     description = "Number of beginning characters left unchanged for fuzzy matching."
                 ) },
-            description = "Match additional options as <<esql-function-named-params,function named parameters>>."
+            description = "(Optional) Match additional options as <<esql-function-named-params,function named parameters>>."
                 + " See <<query-dsl-match-query,match query>> for more information.",
             optional = true
         ) Expression options

docs/reference/esql/functions/kibana/definition/match.json

@@ -1253,7 +1253,7 @@ private static void renderKibanaFunctionDefinition(
                     builder.startObject();
                     builder.field("name", arg.name());
                     if (arg.mapArg()) {
-                        builder.field("type", "function named parameters");
+                        builder.field("type", "function_named_parameters");
                         builder.field(
                             "mapParams",
                             arg.mapParams()