[SPARK-29587][DOC][FOLLOWUP] Add `SQL` tab in the `Data Types` page
[SPARK-29587][DOC][FOLLOWUP] Add `SQL` tab in the `Data Types` page

### What changes were proposed in this pull request?
Add the new tab `SQL` in the `Data Types` page.

### Why are the changes needed?
New type added in SPARK-29587.

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

### How was this patch tested?
Locally test by Jekyll.
![image](https://user-images.githubusercontent.com/4833765/73908593-2e511d80-48e5-11ea-85a7-6ee451e6b727.png)

Closes #27447 from xuanyuanking/SPARK-29587-follow.

Authored-by: Yuanjian Li <2d53d9b773e88f84fee6a6dbdff6a5bb5ed7b612@gmail.com>
Signed-off-by: Dongjoon Hyun <9b02cb7e37158797a8e22c559f7c5f5ecd28ea57@apple.com>

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