docs: remove PSA wording for SPM chapters

PSA wording is not longer associated with FF-A.

Change-Id: Id7c53b9c6c8f383543f6a32a15eb15b7749d8658
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/docs/about/features.rst b/docs/about/features.rst
index 964cb25..f5fc1e0 100644
--- a/docs/about/features.rst
+++ b/docs/about/features.rst
@@ -108,7 +108,7 @@
 
 -  Refinements to Position Independent Executable (PIE) support.
 
--  Continued support for the PSA FF-A v1.0 (formally known as SPCI) specification, to enable the
+-  Continued support for the FF-A v1.0 (formally known as SPCI) specification, to enable the
    use of secure partition management in the secure world.
 
 -  Documentation enhancements.
@@ -126,4 +126,4 @@
 
 --------------
 
-*Copyright (c) 2019-2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*