doc: clarify gcc-multilib instructions for AArch64

Changed 'remove' to 'omit' to clarify package instructions for
AArch64 systems. This improves clarity for users following the
Zephyr SDK setup guide.

Signed-off-by: Sheeba Babu <sheebakarickom@gmail.com>

Author: sheebzzz

doc/develop/getting_started/index.rst

@@ -84,7 +84,7 @@ The current minimum required version for the main dependencies are:
          .. note::
 
             Due to the unavailability of ``gcc-multilib`` and ``g++-multilib`` on AArch64
-            (ARM64) systems, you may need to remove them from the list of packages to install.
+            (ARM64) systems, you may need to omit them from the list of packages to install.
 
       #. Verify the versions of the main dependencies installed on your system by entering: