Merge pull request #56673 from niuzhenguo/fix-diff-cmd-typo

Automatic merge from submit-queue (batch tested with PRs 56639, 56746, 56715, 56673, 56726). 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>.

Fix a typo in kubectl/diff cmd long description.

**What this PR does / why we need it**:

Correct a typo in kubelet alpha diff cmd long description.

**Release note**:
```release-note
NONE
```
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Kubernetes Submit Queue 2017-12-16 06:39:47 -08:00 committed by GitHub
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@ -44,7 +44,7 @@ var (
Diff configurations specified by filename or stdin between their local,
last-applied, live and/or "merged" versions.
LOCAL and LIVE versions are diffed by default. Other availble keywords
LOCAL and LIVE versions are diffed by default. Other available keywords
are MERGED and LAST.
Output is always YAML.