Update git diff

Author: sy-records

docs/tools/git.md

@@ -225,8 +225,9 @@ git diff file1 file2 > xxx.patch
 git apply xxx.patch
 ```
 
-## 获取两个分支的差异文件
+## 获取两个分支/commitID的差异文件
 
 ```bash
 git diff master dev --stat --name-only
+git diff xxxxxx xxxxxx --stat --name-only
 ```