docs: diff placeholder colors for date fields

[pavelstianko]

date field, date picker, date range field, date range picker

[changeset-bot]

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Latest commit: 8200e4c

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Name	Status	Preview	Comments	Updated (UTC)
bits-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2024 8:21pm

[huntabyte]

Awesome!