update readme

Author: Bamieh

test/common/README.md

@@ -380,8 +380,7 @@ Synchronous version of `spawnPwd`.
 The `Countdown` module provides a simple countdown mechanism for tests that
 require a particular action to be taken after a given number of completed
 tasks (for instance, shutting down an HTTP server after a specific number of
-requests). Note that _the Countdown will fail the test if the remainder
-did not reach 0_.
+requests). The Countdown will fail the test if the remainder did not reach 0.
 
 <!-- eslint-disable strict, required-modules -->
 ```js