SPLIT AT Doc Update - more expiration details

[andreimatei]

Andrei Matei (andreimatei) commented:

Re: SPLIT AT

In the Set the expiration on a split enforcement section, we should specify that, if an expiration is not provided, the splits stay forever.
Also, the section would benefit from an example using an interval. Right now it only provides an absolute time, but it's much more common to want to say "this split should live for one hour".

Jira Issue: DOC-1080

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