[doc] oaepLabel option missing from crypto.publicEncrypt's "key" value

[BigBrainAFK]

While the docs mention the oaepHash value for the object of the key value for the crypto.publicEncrypt function they don't mention the oaepLabel value that can also be specified in said object.

[bnoordhuis]

Looks like it was accidentally removed from the docs in an overhaul. I've opened #31825, thanks for the report.