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cmd: kubectl: remove golint_failures entry

**What this PR does / why we need it**:
       
`.golint_failures` currently has an entry for `cmd/kubectl/app`. We can lint this package and remove the entry. There is only one `golint` warning; comment on exported function Run should be of the form "Run..."
    
Fix documentation comment and remove `cmd/kubectl/app` from `.golint_failures`.

**Release note**:

```release-note
NONE
```
/sig cli
/kind cleanup