Rename poky-extract-sdk to runqemu-extract-sdk

(From yocto-docs rev: b4189cf91d4bc79fa1d6ab09fd99d1204dad5b01)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/poky-ref-manual/development.xml

@@ -383,7 +383,7 @@
                         triplet is "i586-poky-linux".</para></listitem>
                         <listitem><para>Kernel: Use the file chooser to select the kernel used with QEMU.</para></listitem>
                         <listitem><para>Root filesystem: Use the file chooser to select the root 
-                        filesystem directory.  This directory is where you use "poky-extract-sdk" to extract the 
+                        filesystem directory.  This directory is where you use "runqemu-extract-sdk" to extract the 
                         core-image-sdk tarball.</para></listitem>
                      </itemizedlist>
                 </para>