Update source_install-nebula-graph-by-rpm-or-deb.md

docs-2.0/reuse/source_install-nebula-graph-by-rpm-or-deb.md

@@ -115,27 +115,27 @@ RPM和DEB是Linux系统下常见的两种安装包格式，本文介绍如何使
 
 - 安装RPM包
 
-    ```bash
-    $ sudo rpm -ivh --prefix=<installation_path> <package_name>
-    ```
+  ```bash
+  $ sudo rpm -ivh --prefix=<installation_path> <package_name>
+  ```
 
-    例如安装在默认路径下{{nebula.release}}版本的RPM包：
+  例如安装在默认路径下{{nebula.release}}版本的RPM包：
 
-    ```bash
-    sudo rpm -ivh nebula-graph-{{nebula.release}}.el7.x86_64.rpm
-    ``` 
+  ```bash
+  sudo rpm -ivh nebula-graph-{{nebula.release}}.el7.x86_64.rpm
+  ``` 
 
 - 安装DEB包
 
-    ```bash
-    $ sudo dpkg -i --instdir==<installation_path> <package_name>
-    ```
+  ```bash
+  $ sudo dpkg -i --instdir==<installation_path> <package_name>
+  ```
 
-    例如安装在默认路径下{{nebula.release}}版本的DEB包：
+  例如安装在默认路径下{{nebula.release}}版本的DEB包：
 
-    ```bash
-    sudo dpkg -i nebula-graph-{{nebula.release}}.ubuntu1804.amd64.deb
-    ```
+  ```bash
+  sudo dpkg -i nebula-graph-{{nebula.release}}.ubuntu1804.amd64.deb
+  ```
 
 !!! Note