Merge pull request #53364 from tcharding/kubectl-app

Automatic merge from submit-queue (batch tested with PRs 53204, 53364, 53559, 53589, 53088). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

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

cmd/kubectl/app/kubectl.go

@@ -31,6 +31,8 @@ import (
 WARNING: this logic is duplicated, with minor changes, in cmd/hyperkube/kubectl.go
 Any salient changes here will need to be manually reflected in that file.
 */
+
+// Run runs the kubectl program (creates and executes a new cobra command).
 func Run() error {
 	logs.InitLogs()
 	defer logs.FlushLogs()