[thread.once.callonce] INVOKE is evaluated, not called (#6810)

Author: CaseyCarter

source/threads.tex

@@ -8220,7 +8220,7 @@
 \effects
 An execution of \tcode{call_once} that does not call its \tcode{func} is a
 \term{passive} execution. An execution of \tcode{call_once} that calls its \tcode{func}
-is an \term{active} execution. An active execution calls
+is an \term{active} execution. An active execution evaluates
 \tcode{\placeholdernc{INVOKE}(\brk{}%
 std::forward<Callable>(func),
 std::forward<Args>(args)...)}\iref{func.require}. If such a call to \tcode{func}