[SPARK-30703][SQL][DOCS][FOLLOWUP] Declare the ANSI SQL compliance options as experimental
[SPARK-30703][SQL][DOCS][FOLLOWUP] Declare the ANSI SQL compliance options as experimental

### What changes were proposed in this pull request?

This is a follow-up of https://github.com/apache/spark/pull/27489.
It declares the ANSI SQL compliance options as experimental in the documentation.

### Why are the changes needed?

The options are experimental. There can be new features/behaviors in future releases.

### Does this PR introduce any user-facing change?

No

### How was this patch tested?

Generating doc

Closes #27590 from gengliangwang/ExperimentalAnsi.

Authored-by: Gengliang Wang <bfe1a7b36425bd89859a70a36586361d28ec35eb@databricks.com>
Signed-off-by: HyukjinKwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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