HyukjinKwon opened a new pull request #29606:
URL: https://github.com/apache/spark/pull/29606
### What changes were proposed in this pull request?
This PR is a minor followup to fix:
1. Slightly reword the wording in the main page.
2. The indentation in the table at the migration guide;
from

to

### Why are the changes needed?
In order to show the migration guide pretty.
### Does this PR introduce _any_ user-facing change?
Yes, this is a change to user-facing documentation.
### How was this patch tested?
Manually built the documentation.
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