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fix the inconsistent description of TopologyKey in PodAffinityTerm

**What this PR does / why we need it**:
Clarify the confusing of inconsistent description.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Just fix #54276
**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```