Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

A small documentation fix.

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# gpg: Signature made Wed 25 May 2022 05:48:53 AM PDT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  docs: Correct the default thread-pool-size

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>