Update 29.2.2. MongoTemplate.md

IV. Spring Boot features/29.2.2. MongoTemplate.md

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+### 29.2.2.  MongoDBTemplate
+
+Spring Data Mongo提供了一个[MongoTemplate](http://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb/core/MongoTemplate.html)类，它的设计和Spring的JdbcTemplate很相似。正如JdbcTemplate一样，Spring Boot会为你自动配置一个bean，你只需简单的注入它即可：
+```java
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.stereotype.Component;
+
+@Component
+public class MyBean {
+
+    private final MongoTemplate mongoTemplate;
+
+    @Autowired
+    public MyBean(MongoTemplate mongoTemplate) {
+        this.mongoTemplate = mongoTemplate;
+    }
+    // ...
+}
+```
+具体参考MongoOperations Javadoc。