### What changes were proposed in this pull request?
A followup of https://github.com/apache/spark/pull/27936 to update document.
### Why are the changes needed?
correct document
### Does this PR introduce any user-facing change?
no
### How was this patch tested?
N/A
Closes#27950 from cloud-fan/null.
Authored-by: Wenchen Fan <wenchen@databricks.com>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
### What changes were proposed in this pull request?
This PR intends to fix typos and phrases in the `/docs` directory. To find them, I run the Intellij typo checker.
### Why are the changes needed?
For better documents.
### Does this PR introduce any user-facing change?
No.
### How was this patch tested?
N/A
Closes#27819 from maropu/TypoFix-20200306.
Authored-by: Takeshi Yamamuro <yamamuro@apache.org>
Signed-off-by: Gengliang Wang <gengliang.wang@databricks.com>
### 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 <gengliang.wang@databricks.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>