doc: completion: context, scope and language fixes
doc: completion: context, scope and language fixes

Fix for imprecise/wrong statements on context in which wait_for_completion*()
can be called, updated notes on "going out of scope" problems and some
language fixups.

Signed-off-by: Nicholas Mc Guire <1f1947151fff46847c7ab253c8b8ee2fc7e63b14@osadl.org>
Acked-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>
Signed-off-by: Jonathan Corbet <b2ce64d5587c02f12e367eac59751145a0660c51@lwn.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs