Polish ExpressionAuthorizationDecision

Issue gh-11493

Author: jzheaux

core/src/main/java/org/springframework/security/authorization/ExpressionAuthorizationDecision.java

@@ -39,8 +39,8 @@ public Expression getExpression() {
 
 	@Override
 	public String toString() {
-		return getClass().getSimpleName() + " [" + "granted=" + isGranted() + ", expressionAttribute=" + this.expression
-				+ ']';
+		return getClass().getSimpleName() + " [" + "granted=" + isGranted() + ", expressionAttribute="
+				+ this.expression.getExpressionString() + ']';
 	}
 
 }