porting: document new block device opening order

We've changed the order of opening block devices and superblock
handling. Let's document this so filesystem and vfs developers have
a proper digital paper trail.

Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2023-09-15 16:01:02 +02:00
commit 2ba0dd6562
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