Fix misc typos

Closes gh-985

Author: vpavic

spring-session/src/main/java/org/springframework/session/FindByIndexNameSessionRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2016 the original author or authors.
+ * Copyright 2014-2018 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.
@@ -52,7 +52,7 @@ public interface FindByIndexNameSessionRepository<S extends Session>
 	 * {@link FindByIndexNameSessionRepository#PRINCIPAL_NAME_INDEX_NAME} and the value of
 	 * the specified principal name.
 	 *
-	 * @param indexName the name if the index (i.e.
+	 * @param indexName the name of the index (i.e.
 	 * {@link FindByIndexNameSessionRepository#PRINCIPAL_NAME_INDEX_NAME})
 	 * @param indexValue the value of the index to search for.
 	 * @return a Map (never null) of the session id to the {@link Session} of all sessions

spring-session/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java

@@ -277,7 +277,7 @@ public class RedisOperationsSessionRepository implements
 	static final String LAST_ACCESSED_ATTR = "lastAccessedTime";
 
 	/**
-	 * The prefix of the key for used for session attributes. The suffix is the name of
+	 * The prefix of the key used for session attributes. The suffix is the name of
 	 * the session attribute. For example, if the session contained an attribute named
 	 * attributeName, then there would be an entry in the hash named
 	 * sessionAttr:attributeName that mapped to its value.