Polish contribution

See gh-34295

Author: sbrannen

spring-core/src/main/java/org/springframework/core/SpringProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -123,8 +123,8 @@ public static void setFlag(String key) {
 	/**
 	 * Retrieve the flag for the given property key.
 	 * @param key the property key
-	 * @return {@code true} if the property is not {@code null} and is equal, ignoring case, to the string "true",
-	 * {@code} false otherwise
+	 * @return {@code true} if the property is set to the string "true"
+	 * (ignoring case), {@code} false otherwise
 	 */
 	public static boolean getFlag(String key) {
 		return Boolean.parseBoolean(getProperty(key));