Fix Changelog format

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/bugfix_3782.txt b/ChangeLog.d/bugfix_3782.txt
index 25e18cb..a92dffa 100644
--- a/ChangeLog.d/bugfix_3782.txt
+++ b/ChangeLog.d/bugfix_3782.txt
@@ -1,2 +1,2 @@
 Bugfix
-  * Fix build failures on GCC 11. Fixes #3782.
+   * Fix build failures on GCC 11. Fixes #3782.
diff --git a/ChangeLog.d/x509-add-tag-check-to-algorithm-params b/ChangeLog.d/x509-add-tag-check-to-algorithm-params.txt
similarity index 100%
rename from ChangeLog.d/x509-add-tag-check-to-algorithm-params
rename to ChangeLog.d/x509-add-tag-check-to-algorithm-params.txt