Remove redundant `toString()` call and trailing "in" from error message

The `formatErrorForReturnValue` method in `ServletInvocableHandlerMethod` previously included an unnecessary call to `toString()` and a dangling "in" at the end of the formatted string.

Since the surrounding context already provides sufficient information, both the `toString()` call and the `" in"` suffix have been removed to improve clarity.

No functional changes.

Signed-off-by: wonyongg <111210881+wonyongg@users.noreply.github.com>

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ServletInvocableHandlerMethod.java

@@ -189,8 +189,7 @@ public class ServletInvocableHandlerMethod extends InvocableHandlerMethod {
 
 	private String formatErrorForReturnValue(@Nullable Object returnValue) {
 		return "Error handling return value=[" + returnValue + "]" +
-				(returnValue != null ? ", type=" + returnValue.getClass().getName() : "") +
-				" in " + toString();
+				(returnValue != null ? ", type=" + returnValue.getClass().getName() : "");
 	}
 
 	/**