Doc: add space at the end of efibootmgr bootloader

This is a workaround for the issue in efi-stub: If the EFI option is loaded to a memory range which is not all zero filled,
it's possible the garbage string appended to bootloader name string.
Which could make system can't boot.

Add an extra space to the EFI option to make sure space could be used to detect the end of bootloader name string.

Once the fixing patch is merged, we don't need this extra space.
But to make old ACRN work, we'd like to keep the space here.

Signed-off-by: fuzhongl <fuzhong.liu@intel.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>

doc/getting-started/rt_industry.rst

@@ -206,6 +206,10 @@ Use the ACRN industry out-of-the-box image
 
       # efibootmgr -c -l "\EFI\acrn\acrn.efi" -d /dev/sda -p 1 -L "ACRN" -u "uart=port@0x3f8 "
 
+   .. note:: This is a workaround for the issue in efi-stub;
+      Add an extra space to the EFI option to make sure space could be used to detect the end of bootloader name string.
+      The extra space can be removed after the issue in efi-stub is fixed later.
+
 #. Reboot the test machine. After the Clear Linux OS boots,
    log in as “root” for the first time.
 

doc/tutorials/using_ubuntu_as_sos.rst

@@ -118,6 +118,11 @@ the source code, build it, and install it on your device.
          sudo efibootmgr -c -l "\EFI\acrn\acrn.efi" -d /dev/nvme0n1 -p 1 \
                 -L "ACRN Hypervisor" -u "bootloader=\EFI\ubuntu\grubx64.efi "
 
+      .. Note::
+         This is a workaround for the issue in efi-stub;
+         Add an extra space to the EFI option to make sure space could be used to detect the end of bootloader name string.
+         This extra space can be removed after issue in efi-stub fixed later.
+
    #. Verify that "ACRN Hypervisor" is added and that it will boot first:
 
       .. code-block:: none