workqueue: Fixes for v6.6-rc5

* Fix access-after-free in pwq allocation error path.

* Implicitly ordered unbound workqueues should lose the implicit ordering if
  an attribute change which isn't compatible with ordered operation is
  requested. However, attribute changes requested through the sysfs
  interface weren't doing that leaving no way to override the implicit
  ordering through the sysfs interface. Fix it.

* Other doc and misc updates.
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