DATAMONGO-1577 - Fix wording repetition in MongoRepository JavaDoc.

Original pull request: #407.

Author: kryger

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/MongoRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2016 the original author or authors.
+ * Copyright 2010-2017 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.
@@ -55,7 +55,7 @@ public interface MongoRepository<T, ID extends Serializable>
 	List<T> findAll(Sort sort);
 
 	/**
-	 * Inserts the given a given entity. Assumes the instance to be new to be able to apply insertion optimizations. Use
+	 * Inserts the given entity. Assumes the instance to be new to be able to apply insertion optimizations. Use
 	 * the returned instance for further operations as the save operation might have changed the entity instance
 	 * completely. Prefer using {@link #save(Object)} instead to avoid the usage of store-specific API.
 	 *