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Add function comment to fix golint error in cmd/kube-scheduler/app.

**What this PR does / why we need it**:
Add function comment to fix golint error in cmd/kube-scheduler/app.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
NONE

**Special notes for your reviewer**:
NONE

**Release note**:

```release-note
NONE
```