Raise the minimum supported version of Java to 17

Closes gh-749

spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/OperationResponseFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2019 the original author or authors.
+ * Copyright 2014-2021 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.
@@ -41,6 +41,15 @@ public class OperationResponseFactory {
 		return this.create(status.value(), headers, content);
 	}
 
+	/**
+	 * Creates a new {@link OperationResponse}. If the response has any content, the given
+	 * {@code headers} will be augmented to ensure that they include a
+	 * {@code Content-Length} header.
+	 * @param status the status of the response
+	 * @param headers the request's headers
+	 * @param content the content of the request
+	 * @return the {@code OperationResponse}
+	 */
 	public OperationResponse create(int status, HttpHeaders headers, byte[] content) {
 		return new StandardOperationResponse(status, augmentHeaders(headers, content), content);
 	}