Fix Kotlin example code which does not compile

This kotlin code does not compile:
Overload resolution ambiguity. All these functions match.
default <R> RowsFetchSpec<R> map(Function<Row, R> mappingFunction)
<R> RowsFetchSpec<R> map(BiFunction<Row, RowMetadata, R> mappingFunction);

Closes spring-projectsgh-26016

src/docs/asciidoc/data-access.adoc

@@ -6805,7 +6805,7 @@ The following example extracts the `id` column and emits its value:
 .Kotlin
 ----
 	val names = client.sql("SELECT name FROM person")
-	        .map{ it.get("id", String.class) }
+	        .map{ row: Row -> row.get("id", String.class) }
 	        .flow()
 ----