[thread.stoptoken.intro] Fix typo

StephanTLavavej · zygoloid · commit b5b2f60824f0 · 2020-10-26T13:19:14.000-07:00
diff --git a/source/threads.tex b/source/threads.tex
@@ -312,7 +312,7 @@
 
 \pnum
 Subclause \ref{thread.stoptoken} describes components that can be used
-to asynchonously request that an operation stops execution in a timely manner,
+to asynchronously request that an operation stops execution in a timely manner,
 typically because the result is no longer required.
 Such a request is called a \defn{stop request}.
 
