Docs: Update min version requirement for GCC and ARM compiler

- gcc version: Minimum 10.3.2021
- Arm compiler: Minimum v6.21
- IAR compiler: Minimum v9.30.1

Change-Id: I993f3d687dd6f6f5d5a54a693e7af33dab492454
Signed-off-by: Mudit Sharma <mudit.sharma@arm.com>
diff --git a/docs/building/tfm_build_instruction_iar.rst b/docs/building/tfm_build_instruction_iar.rst
index 4bf45d5..87fbc4f 100644
--- a/docs/building/tfm_build_instruction_iar.rst
+++ b/docs/building/tfm_build_instruction_iar.rst
@@ -9,7 +9,7 @@
 Notes for building with IARARM
 ------------------------------
 
-    IAR Embedded Workbench for ARM (EWARM) versions 8.42 or later are required.
+    IAR Embedded Workbench for ARM (EWARM) versions v9.30.1 or later are required.
 
     Currently the MUSCA_B1 and MUSCA_S1 targets are not supported with IARARM,
     due to lack of testing.