[ic-date-picker] Validation in guidance needs update

[gd2910]

What component is this related to?

IcDatePicker currently shows error validation that would not exist.

If disablePast prop is true the user would not be able select a previous date and thus not ebter an error state

[MI6-255]

You can type in the date manually, but this example maybe needs to be cleared up and remove the picker part in the image all together.

This image is appearing in the Date Picker guidance but shows validation on the Date Input, which could be confusing. Suggestion: remove this image! And update guidance to say that you can't Pick an invalid date (validation won't trigger) but a user could type an invalid date - link to Date Input guidance section about Validation instead.