Fix misleading ChangeLog entry formatting.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/ChangeLog.d/bugfix-for-gcm-long-iv-size.txt b/ChangeLog.d/bugfix-for-gcm-long-iv-size.txt
index c04c4aa..4287ea7 100644
--- a/ChangeLog.d/bugfix-for-gcm-long-iv-size.txt
+++ b/ChangeLog.d/bugfix-for-gcm-long-iv-size.txt
@@ -1,4 +1,3 @@
 Bugfix
    * Fix a bug in mbedtls_gcm_starts() when bits of iv are longer than 2^32.
-   * Fix #4884.
-
+     Fixes #4884.