Pengfei Zeng

Results 2 issues of Pengfei Zeng

### Ⅰ. Describe what this PR does Add comments to TestGetMountRoot in pkg\ddc\alluxio\utils_test.go. ### Ⅱ. Does this pull request fix one issue? fixes #5098 ### Ⅲ. List the added test...

needs-ok-to-test

Which function do you want to add comments to? TestGetMountRoot in pkg\ddc\alluxio\utils_test.go. What comments do you want to add? // TestGetMountRoot tests the function that retrieves the mount root directory....