docs: Add more details to the agent checkpoint section (#31898)

Figured this was worth highlighting as part of the "Restore Checkpoint"
feature behavior.

Release Notes:

- N/A
8c46e290dfDanilo Leal committed on 6/2/2025, 1:55:03 PM· committed by GitHubparentaacbb9c
1 file changedLine totals unavailable