docs: alter database ttl

[CookiePieWw]

What's Changed in this PR

#1313 update docs for alter database ttl.

Waiting for GreptimeTeam/greptimedb#5035

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[nicecui]

please modify the document outline to:

# Alter

`ALTER` can be used to modify any database options, table options or metadata of the table, including:
...

## Alter database
### Syntax
### Examples

## Alter table
### Syntax
### Examples

[nicecui]

please also update the zh doc according to the en comments, thanks

[fengjiachun]

LGTM