Remove @SInCE tag from getServlet()

Closes gh-13757

Author: izeye

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletRegistrationBean.java

@@ -112,7 +112,6 @@ public void setServlet(T servlet) {
 	/**
 	 * Return the servlet being registered.
 	 * @return the servlet
-	 * @since 2.0.4
 	 */
 	public T getServlet() {
 		return this.servlet;