[cpp-threads] Lockable and condition_variable_any

[Anthony Williams]

Suggested wording for note at the end of D3197:

"If a Lock type other than one of the standard mutex types (or a 
unique_lock wrapper for a standard mutex type) is used with 
condition_variable_any then the user must ensure that any necessary 
synchronization is in place with respect to the predicate associated 
with the condition_variable_any instance."

Anthony
-- 
Author of C++ Concurrency in Action     http://www.stdthread.co.uk/book/
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