corstone1000: update for CORSTONE1000-2022.01.18

This commit updates Corstone1000 user-guide document based on latest
Yocto meta-arm tag CORSTONE1000-2022.01.18.
Signed-off-by: Xueliang Zhong <xueliang.zhong@arm.com>

docs/embedded-a/corstone1000/user-guide.rst

@@ -126,8 +126,7 @@ In the top directory of the workspace ``<_workspace>``, run:
 
 ::
 
-    git clone https://git.yoctoproject.org/git/meta-arm -b CORSTONE1000-2022.01.06
-
+    git clone https://git.yoctoproject.org/git/meta-arm -b CORSTONE1000-2022.01.18
 
 To build corstone1000 image for MPS3 FPGA, run:
 
@@ -287,7 +286,7 @@ boot. Run following commands to build such image.
 ::
 
   cd <_workspace>
-  git clone https://git.yoctoproject.org/git/meta-arm -b CORSTONE1000-2022.01.06
+  git clone https://git.yoctoproject.org/git/meta-arm -b CORSTONE1000-2022.01.18
   git clone https://git.gitlab.arm.com/arm-reference-solutions/systemready-patch.git
   cp -f systemready-patch/embedded-a/corstone1000/erase_flash/0001-arm-bsp-trusted-firmware-m-corstone1000-Clean-Secure.patch meta-arm
   cd meta-arm
@@ -501,8 +500,8 @@ Run psa-arch-test
 #################
 
 The user should make sure there is no USB stick connected to the board. Power
-on the board and boot the board to Linux. Then, the user should follow the
-steps below to run the psa_arch_tests.
+on the board and boot the board to Linux. Login with the username ``root``.
+Then, the user should follow the steps below to run the psa_arch_tests.
 
 As a reference for the user's test results, the psa-arch-test report for `Corstone1000 software (CORSTONE1000-2021.12.15) <https://git.yoctoproject.org/meta-arm/tag/?h=CORSTONE1000-2021.12.15>`__
 can be found in `here <https://gitlab.arm.com/arm-reference-solutions/arm-reference-solutions-test-report/-/tree/master/embedded-a/corstone1000>`__.