INTERVAL can (at this stage) be an interval literal or a number as seconds

The documentation is rather silent about allowed types.

This can at this stage (Influxdb 3.6) a string literal as noted in the documentation, or it can be an integer as seconds.
Ie: '2 days' for 2 days
or
120 for 120 seconds, same as '120 seconds' or '2 minutes'.

##### Relevant URLs
- https://docs.influxdata.com/influxdb3/enterprise/reference/sql/data-types/
- _Provide other relevant URLs (project issues, community threads, etc.)_

Start with the linked InfluxDB 3.6 data types documentation page and verify the supported INTERVAL forms. Update the relevant section to cover interval string literals and integer seconds, with the examples from the issue. Done means the page clearly states both allowed forms and their equivalent durations.

Written by the indexing model from the issue text.