Add date and time reminder to diagnostic screen
Add date and time reminder to diagnostic screen

Summary: I got tripped up again with a physical iOS device that had the wrong date and time. SSL certs won't be valid. Adds a reminder to the diagnostic screen for anyone running into this in future.

Reviewed By: passy

Differential Revision: D14132411

fbshipit-source-id: 623120ef5252eae3e2fe0f6f653074f586f17e0e

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