Remove redundant throws declarations from non public API

Closes gh-828

docs/src/test/java/com/example/restassured/InvokeService.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2021 the original author or authors.
+ * Copyright 2014-2022 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.
@@ -26,7 +26,7 @@ public class InvokeService {
 
 	private RequestSpecification spec;
 
-	public void invokeService() throws Exception {
+	public void invokeService() {
 		// tag::invoke-service[]
 		RestAssured.given(this.spec) // <1>
 				.accept("application/json") // <2>