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.

Resolves SITSW-8146

Signed-off-by: Telukula Jeevan Kumar Sahu <[email protected]>

Author: jeevantelukula

source/linux/Demo_User_Guides/TI_Apps_Launcher_User_Guide.rst

@@ -273,9 +273,9 @@ Launching the GPU Performance Demo
 
    .. Image:: /images/ti-apps-launcher-gpu-performance.png
       :height: 400
-   
+
    3. You will see the updated values of FPS & Score metrices getting populated in the table.
-   
+
 .. ifconfig:: CONFIG_sdk in ('j7_foundational')
 
    3. The image below is captured while running the `glmark2` with **GPU Load Level as 3**.
@@ -294,7 +294,7 @@ Launching the Seva Store
 
       Seva Store is not supported on AM62xSIP due to it's memory constraints.
 
-1. |__SDK_FULL_NAME__| now supports Seva Store. Seva Store is a TI developed demo gallery which allows users to download and install demos on the go. Developers can host their demos as Docker Images on any public Docker Registry and link them to Seva Design Gallery. 
+1. |__SDK_FULL_NAME__| now supports Seva Store. Seva Store is a TI developed demo gallery which allows users to download and install demos on the go. Developers can host their demos as Docker Images on any public Docker Registry and link them to Seva Design Gallery.
 
 2. Refer :ref:`Seva Store - User Guide <Seva-Store-label>` to know more about Seva Store.
 
@@ -313,13 +313,13 @@ 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')
 
       .. Image:: /images/chromium-browser-am62x.png
-         :height: 400   
+         :height: 400
 
    .. ifconfig:: CONFIG_part_variant in ('AM62PX')
 
@@ -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