Update keywords (#15443)

[ti-chi-bot]

This is an automated cherry-pick of #15443

What is changed, added or deleted? (Required)

1. The scripts/check-keywords.sh script didn't check they "TiDBKeyword" section of "parser.y"
2. The entries in the docs from the "TiDBKeyword" section were labeled as reserved, while that doesn't seem to be the case.
3. Various missing keywords.

This shows the behavior for TIDB and DESC which are both listed as reserved keyword in the docs:

sql> CREATE TABLE TIDB(id INT);
Query OK, 0 rows affected (0.2196 sec)

sql> CREATE TABLE DESC(id INT);
ERROR: 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 1 column 17 near "DESC(id INT)" 

I would expect both to fail, but it looks like TIDB (from the "TiDBKeyword" list) isn't actually reserved.

Which TiDB version(s) do your changes apply to? (Required)

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By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
• v7.1 (TiDB 7.1 versions)
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• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

What is the related PR or file link(s)?

• This PR is translated from:

• Other reference link(s):

• parser, infoschema, executor: Add information_schema.keywords tidb#48807

• parser: Sort keywords tidb#48851

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[Oreoxmt]

/approve

[ti-chi-bot]

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