docs: change all occurrences of RSS to RSE

Changes all occurrences of "RSS" and "rss" in the documentation
to "RSE" and "rse".

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: Ia42078f5faa1db331b1e5a35f01faeaf1afacb5f
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 6d34339..0fade3e 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -337,12 +337,12 @@
 :|F|: include/drivers/arm/mhu.h
 :|F|: drivers/arm/mhu
 
-Runtime Security Subsystem (RSS) comms driver
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Runtime Security Engine (RSE) comms driver
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 :|M|: David Vincze <david.vincze@arm.com>
 :|G|: `davidvincze`_
-:|F|: include/drivers/arm/rss_comms.h
-:|F|: drivers/arm/rss
+:|F|: include/drivers/arm/rse_comms.h
+:|F|: drivers/arm/rse
 
 Libfdt wrappers
 ^^^^^^^^^^^^^^^