Update Spring Boot REST APIs course title in README (#4)

Author: darbyluv2code

README.md

@@ -27,9 +27,9 @@ I'd recommend the following road map:
 For end-to-end project with Spring Boot, Spring MVC and Thymeleaf:
 1. [Spring Boot 4 Project - Build a Job Portal Web Application](https://www.udemy.com/course/spring-boot-project-job-portal-web-app/?referralCode=BB9301596150194B61E2)
 
-### REST API Project Course: Spring Boot REST APIs
+### REST API Project Course: Spring Boot 4 REST APIs
 This is an intermediate level course that includes four REST API projects:
-1. [Spring Boot REST APIs - Building Modern APIs with Spring Boot](https://www.udemy.com/course/spring-boot-rest-apis/)
+1. [Spring Boot 4 REST APIs - Building Modern APIs with Spring Boot](https://www.udemy.com/course/spring-boot-rest-apis/)
 
 ### Project Courses: Full Stack
 For full stack projects, you have the choice of either Angular or React. Pick the one that you like the best.