Fix Changelog formatting

Add EOL and remove trailing whitespaces.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/fix-redefination_warning_messages_for_GNU_SOURCE.txt b/ChangeLog.d/fix-redefination_warning_messages_for_GNU_SOURCE.txt
index ce2e9d5..b5c2650 100644
--- a/ChangeLog.d/fix-redefination_warning_messages_for_GNU_SOURCE.txt
+++ b/ChangeLog.d/fix-redefination_warning_messages_for_GNU_SOURCE.txt
@@ -1,5 +1,5 @@
 Bugfix
-   * Fix issue of redefinition warning messages for _GNU_SOURCE in 
-     entropy_poll.c and sha_256.c. There was a build warning during 
+   * Fix issue of redefinition warning messages for _GNU_SOURCE in
+     entropy_poll.c and sha_256.c. There was a build warning during
      building for linux platform.
-     Resolves #9026
\ No newline at end of file
+     Resolves #9026