Fix typos

Closes gh-11450

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jta/atomikos/AtomikosProperties.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -210,7 +210,7 @@ public class AtomikosProperties {
 	 * different but related subtransactions. This setting has no effect on resource
 	 * access within one and the same transaction. If you don't use subtransactions then
 	 * this setting can be ignored.
-	 * @param serialJtaTransactions if serial JTA transaction are supported
+	 * @param serialJtaTransactions if serial JTA transactions are supported
 	 */
 	public void setSerialJtaTransactions(boolean serialJtaTransactions) {
 		this.serialJtaTransactions = serialJtaTransactions;

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/origin/Origin.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -19,7 +19,7 @@ package org.springframework.boot.origin;
 import java.io.File;
 
 /**
- * Interface that uniquely represents the origin of an item. For example, a item loaded
+ * Interface that uniquely represents the origin of an item. For example, an item loaded
  * from a {@link File} may have an origin made up of the file name along with line/column
  * numbers.
  * <p>

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServer.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -35,7 +35,7 @@ import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringUtils;
 
 /**
- * {@link WebServer} that can be used to control a Undertow web server. Usually this class
+ * {@link WebServer} that can be used to control an Undertow web server. Usually this class
  * should be created using the {@link UndertowReactiveWebServerFactory} and not directly.
  *
  * @author Ivan Sopov

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

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -81,7 +81,7 @@ public abstract class SpringBootServletInitializer implements WebApplicationInit
 
 	@Override
 	public void onStartup(ServletContext servletContext) throws ServletException {
-		// Logger initialization is deferred in case a ordered
+		// Logger initialization is deferred in case an ordered
 		// LogServletContextInitializer is being used
 		this.logger = LogFactory.getLog(getClass());
 		WebApplicationContext rootAppContext = createRootApplicationContext(