handbook: Correction, we're building QEMU x86 not QEMU Arm image

Signed-off-by: Joshua Lock <josh@linux.intel.com>

handbook/introduction.xml

@@ -173,7 +173,7 @@ provided by the principal developer and maintainer of Poky, <ulink url="http://o
         <para>
             If you want to try Poky, you can do so in a few commands. The example below
             checks out the Poky source code, sets up a build environment, builds an
-            image and then runs that image under the QEMU emulator in ARM system emulation mode:
+            image and then runs that image under the QEMU emulator in x86 system emulation mode:
         </para>
 
         <para>