kernel-dev: Fixed missed shortcut

(From yocto-docs rev: 3f9c25820bb93f8efb6eaf415e9d7a9545832a7c)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/kernel-dev/kernel-dev-advanced.xml

@@ -138,7 +138,8 @@
         to include features (configuration fragments, patches, or both) that
         are not already included by the <filename>KMACHINE</filename> and
         <filename>LINUX_KERNEL_TYPE</filename> variable combination.
-        For example, to include a feature specified as "features/netfilter.scc",
+        For example, to include a feature specified as
+        "features/netfilter/netfilter.scc",
         specify:
         <literallayout class='monospaced'>
      KERNEL_FEATURES += "features/netfilter/netfilter.scc"