Reword changelog - Test Resource Leak

- “Fix an issue where X happens” → ”Fix X“
  the extra words are just a distraction.
- “resource” → “a resource”
- “where resource is never freed” has a name: it's a resource leak
- “when running one particular test suite” → “in a test suite”

Signed-off-by: Joe Subbiani <joe.subbiani@arm.com>
diff --git a/ChangeLog.d/issue4176.txt b/ChangeLog.d/issue4176.txt
index d362f10..ddca37f 100644
--- a/ChangeLog.d/issue4176.txt
+++ b/ChangeLog.d/issue4176.txt
@@ -1,3 +1,3 @@
 Bugfix
-   * Fix an issue where resource is never freed when running one particular
-     test suite with an alternative AES implementation. Fixes #4176.
+   * Fix a resource leak in a test suite with an alternative AES
+     implementation. Fixes #4176.