[SPARK-30616][SQL][FOLLOW-UP] Use only config key name in the config doc. #29194
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What changes were proposed in this pull request?
This is a follow-up of #28852.
This PR to use only config name; otherwise the doc for the config entry shows the entire details of the referring configs.
Why are the changes needed?
The doc for the newly introduced config entry shows the entire details of the referring configs.
Does this PR introduce any user-facing change?
The doc for the config entry will show only the referring config keys.
How was this patch tested?
Existing tests.