Update changelog formatting - Missing Free Context

Missing trailing full stop added to the end of the fixed issue number

Signed-off-by: Joe Subbiani <joe.subbiani@arm.com>
diff --git a/ChangeLog.d/issue4176.txt b/ChangeLog.d/issue4176.txt
index e1ed5d6..d362f10 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
+     test suite with an alternative AES implementation. Fixes #4176.