Improve Changelog wording

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/ChangeLog b/ChangeLog
index d79a050..bdeb8f0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -455,7 +455,7 @@
      make to break on a clean checkout. Fixes #5340.
    * Work around an MSVC ARM64 compiler bug causing incorrect behaviour
      in mbedtls_mpi_exp_mod(). Reported by Tautvydas Žilys in #5467.
-   * Removed the prompt to exit from all windows build programs that was causing
+   * Removed the prompt to exit from all windows build programs, which was causing
      issues in CI/CD environments.
 
 Changes