Docs: Add a note that the `$args` parameter of `register_block_type()` accepts...

Docs: Add a note that the `$args` parameter of `register_block_type()` accepts any public property of `WP_Block_Type`.

Follow-up to [47754].

Props ediamin.
See #48640.
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git-svn-id: https://core.svn.wordpress.org/trunk@48391 1a063a9b-81f0-0310-95a4-ce76da25c4cd