fix(docs): incorrect indentation in change log

Readthedocs job[1] which builds tf-a-tests documentation has been
failing silently since few days with the following message:

	WARNING: Unexpected indentation

This patch makes the necessary fix.

[1] https://readthedocs.org/projects/trustedfirmware-a-tests/builds/20363586/

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: Icf762428d3e2b57290c6e8e34a4cfeb897dcf140
diff --git a/docs/change-log.rst b/docs/change-log.rst
index 591f3c0..8a99d1c 100644
--- a/docs/change-log.rst
+++ b/docs/change-log.rst
@@ -348,6 +348,7 @@
 ^^^^^^^^^^^^
 -  More tests are made available in this release to help validate the
    functionalities in the following areas:
+
     -  True Random Number Generator (TRNG) test scenarios.
     -  Multicore / Power State Controller Interface (PSCI) tests.
     -  v8.6 Activity Monitors Unit (AMU) enhancements test scenarios.