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/components/index.rst b/docs/components/index.rst
index ffeef80..2409f96 100644
--- a/docs/components/index.rst
+++ b/docs/components/index.rst
@@ -19,6 +19,6 @@
    sdei
    secure-partition-manager
    secure-partition-manager-mm
-   psa-ffa-manifest-binding
+   ffa-manifest-binding
    xlat-tables-lib-v2-design
    cot-binding