[SPARK-30289][FOLLOWUP][DOC] Update the migration guide for `spark.sql.legacy.ctePrecedencePolicy`
[SPARK-30289][FOLLOWUP][DOC] Update the migration guide for `spark.sql.legacy.ctePrecedencePolicy`

### What changes were proposed in this pull request?
Fix the migration guide document for `spark.sql.legacy.ctePrecedence.enabled`, which is introduced in #27579.

### Why are the changes needed?
The config value changed.

### Does this PR introduce any user-facing change?
No.

### How was this patch tested?
Document only.

Closes #27782 from xuanyuanking/SPARK-30829-follow.

Authored-by: Yuanjian Li <2d53d9b773e88f84fee6a6dbdff6a5bb5ed7b612@gmail.com>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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