docs: document incident digest lookback (APP-1547)

[MikaKerman]

Summary

• Document Full incident status vs Only what changed on the existing Incidents Digest page.
• Cover lookback (1/3/7/14/30 days), New markers, and that existing rules stay incremental until edited.

APP-1547

Test plan

• Preview locally (mintlify dev in docs/) and read the Incidents digest page
• Confirm cadence, filters, and management sections are still accurate
• Confirm the note about switching an existing rule is clear

Made with Cursor

[linear]

APP-1547

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