Docs: Update supported Arm Complier versions

Instead of explicitly set all supported versions the minimum version
is defined from now.

Change-Id: I27371df627c0ae69d08510276e2447cd60169d2d
Signed-off-by: Mark Horvath <mark.horvath@arm.com>
diff --git a/docs/getting_started/tfm_sw_requirement.rst b/docs/getting_started/tfm_sw_requirement.rst
index ef4382b..530f7f9 100644
--- a/docs/getting_started/tfm_sw_requirement.rst
+++ b/docs/getting_started/tfm_sw_requirement.rst
@@ -35,7 +35,7 @@
 be available in the build environment. The currently supported compiler
 versions are:
 
-    - Arm Compiler v6.10.1+, v6.11, v6.12, v6.13
+    - Arm Compiler v6.10.1+
     - GNU Arm compiler v7.3.1+
     - IAR Arm compiler v8.42.x, v8.50.x
 
@@ -463,4 +463,4 @@
 
 --------------
 
-*Copyright (c) 2017-2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2017-2021, Arm Limited. All rights reserved.*