[PATCH] locking/lockdep: Revise Documentation/locking/crossrelease.txt

[Byungchul Park]

I'm afraid the revision is not perfect yet. Of course, the document can
have got much better english by others than me.

But,

I think I should enhance it as much as I can, before they can help it
starting with a better one.

In addition, I removed verboseness as much as possible.

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