doc: quick_start: nRF54H20 edit

[greg-fer]

Removed the mention of "quick start support not yet available" from the quick start table for the nRF54H20 DK.

[NordicBuilder]

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[NordicBuilder]

You can find the documentation preview for this PR at this link.

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[chunfantasy]

According to the message from today's HCS sprint review, there is no plan to support nRF54H20 in NCD and VSC in the year of 2025. So approved from my side.