Improve configuration keys documentation

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/OAuth2ClientProperties.java

@@ -24,13 +24,20 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
  * Configuration properties for OAuth2 Client.
  *
  * @author Dave Syer
+ * @author Stephane Nicoll
  * @since 1.3.0
  */
 @ConfigurationProperties("spring.oauth2.client")
 public class OAuth2ClientProperties {
 
+	/**
+	 * OAuth2 client id.
+	 */
 	private String clientId;
 
+	/**
+	 * OAuth2 client secret. A random secret is generated by default.
+	 */
 	private String clientSecret = UUID.randomUUID().toString();
 
 	private boolean defaultSecret = true;

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2SsoProperties.java

@@ -36,7 +36,7 @@ public class OAuth2SsoProperties {
 	private String loginPath = DEFAULT_LOGIN_PATH;
 
 	/**
-	 * The filter order to apply if not providing an explicit WebSecurityConfigurerAdapter
+	 * Filter order to apply if not providing an explicit WebSecurityConfigurerAdapter
 	 * (in which case the order can be provided there instead).
 	 */
 	private Integer filterOrder;

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -598,6 +598,9 @@ public class ServerProperties implements EmbeddedServletContainerCustomizer, Ord
 		 */
 		private Integer workerThreads;
 
+		/**
+		 * Allocate buffers outside the Java heap.
+		 */
 		private Boolean directBuffers;
 
 		/**