Merge pull request qibaoguang#6 from zzg16/patch-1

Update 25.4. Log Levels.md

Author: qibaoguang

IV. Spring Boot features/25.4. Log Levels.md

@@ -4,6 +4,6 @@
 
 示例：application.properties
 ```java
-logging.level.org.springframework.web: DEBUG
-logging.level.org.hibernate: ERROR
+logging.level.org.springframework.web=DEBUG
+logging.level.org.hibernate=ERROR
 ```