Clarify why the generic wrapper result isn't defaulted

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: oryan-block

src/main/kotlin/graphql/kickstart/tools/resolver/MethodFieldResolver.kt

@@ -274,7 +274,7 @@ private fun Any.transformWithGenericWrapper(
         .firstOrNull()
         ?: return this
 
-    // a transformer may map a value to null, e.g. the empty case of an Option-like wrapper
+    // returned as is, even if null, so a transformer can map a value to null
     return genericWrapper.transformer(this, environmentSupplier.get())
 }