feat(linux): Add incomplete ti-apps-launcher demo build steps

Few clarifying steps are missing for compiling the ti-apps-launcher
from sources. Mention them for better clarity.

Signed-off-by: Telukula Jeevan Kumar Sahu <j-sahu@ti.com>

Author: jeevantelukula

source/linux/Demo_User_Guides/TI_Apps_Launcher_User_Guide.rst

@@ -313,7 +313,7 @@ Launching the Chromium Browser
       Chromium Browser is not supported on AM62xSIP due to it's memory constraints.
 
 1. |__SDK_FULL_NAME__| now supports GPU Accelarated Chromium Browser. Click on the Chromium button on the left panel.
-  
+
 2. Click Launch button to launch the Chromium Browser. The Browser launches with `WebGL Aquarium <https://webglsamples.org/aquarium/aquarium.html>`__ as the first tab by default.
 
    .. ifconfig:: CONFIG_part_variant in ('AM62X')
@@ -464,6 +464,12 @@ Then, add the following line in :file:`CMakeLists.txt`:
    add_compile_definitions(SOC_AM62_LP=1) # if target is AM62x-LP
    add_compile_definitions(SOC_AM62P=1) # if target is AM62P
 
+Then, install the QEMU user mode emulators for enabling cross-architecture execution on host system:
+
+.. code:: console
+
+   sudo apt-get install qemu-user-static
+
 Then, pull TI's debian-arm64 Docker image and run it:
 
 .. code:: console
@@ -474,7 +480,7 @@ Then, pull TI's debian-arm64 Docker image and run it:
 Finally, run:
 
 .. code:: console
-
+   cd /root/ti-apps-launcher/
    cmake -B build -S . -DRT_BUILD=0 # if target is RT image, make -DRT_BUILD=1
    make -C build