Fix Kotlin code formatting for Inline Maps section of ref docs

Closes gh-26836

src/docs/asciidoc/core/core-expressions.adoc

@@ -958,7 +958,7 @@ following example shows how to do so:
 
 	Map mapOfMaps = (Map) parser.parseExpression("{name:{first:'Nikola',last:'Tesla'},dob:{day:10,month:'July',year:1856}}").getValue(context);
 ----
-[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
+[source,kotlin,indent=0,subs="verbatim",role="secondary"]
 .Kotlin
 ----
 	// evaluates to a Java map containing the two entries