Fix typo in BasicJsonWriter.java

See gh-28890

spring-core/src/main/java/org/springframework/aot/nativex/BasicJsonWriter.java

@@ -245,7 +245,7 @@ public IndentingWriter println() {
 		/**
 		 * Increase the indentation level and execute the {@link Runnable}. Decrease the
 		 * indentation level on completion.
-		 * @param runnable the code to execute withing an extra indentation level
+		 * @param runnable the code to execute within an extra indentation level
 		 */
 		public IndentingWriter indented(Runnable runnable) {
 			indent();