Fix typo in message from assert statement (GH-21283)

The error message was missing space between the action "acquire" and "_wait_semaphore" which is an attribute for instances of Condition.
(cherry picked from commit 99c0ee3c89)

Co-authored-by: Allen <64019758+aboddie@users.noreply.github.com>
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Miss Islington (bot) 2020-09-04 15:55:05 -07:00 committed by GitHub
parent fbb9ee0a90
commit 8ed1c177c9
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