THREADING.md: Fix broken link.

peterhinch · peterhinch · commit bef5b9b5fcfe · 2023-10-25T14:05:49.000+01:00
diff --git a/v3/docs/THREADING.md b/v3/docs/THREADING.md
@@ -719,7 +719,7 @@ asyncio.run(main())
 ```
 ###### [Contents](./THREADING.md#contents)
 
-## 4.1 More general solution
+## 4.2 More general solution
 
 This provides a queueing mechanism. A task can assign a blocking function to a
 core even if the core is already busy. Further it allows for multiple cores or
