dev-manual: use actual machine override demonstration

Given that the section in question is describing how to configure
dependencies based on the machine type, it seems inappropriate to use
an example that depends on the choice of C library, so grab a snippet
from linux-yocto.inc to really drive the point home.

(From yocto-docs rev: 66bfec015f61a690f96cf8e28b80869c77327e6d)

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/dev-manual-common-tasks.xml

@@ -319,12 +319,26 @@
      DEPENDS_append_one = " foo"
      DEPENDS_prepend_one = "foo "
                                 </literallayout>
-                                As an actual example, here's a line from the recipe
-                                for gnutls, which adds dependencies on
-                                "argp-standalone" when building with the musl C
-                                library:
+                                As an actual example, here's a snippet from the
+                                generic kernel include file
+                                <filename>linux-yocto.inc</filename>,
+                                wherein the kernel compile and link options are
+                                adjusted in the case of a subset of the supported
+                                architectures:
                                 <literallayout class='monospaced'>
-     DEPENDS_append_libc-musl = " argp-standalone"
+     DEPENDS_append_aarch64 = " libgcc"
+     KERNEL_CC_append_aarch64 = " ${TOOLCHAIN_OPTIONS}"
+     KERNEL_LD_append_aarch64 = " ${TOOLCHAIN_OPTIONS}"
+
+     DEPENDS_append_nios2 = " libgcc"
+     KERNEL_CC_append_nios2 = " ${TOOLCHAIN_OPTIONS}"
+     KERNEL_LD_append_nios2 = " ${TOOLCHAIN_OPTIONS}"
+
+     DEPENDS_append_arc = " libgcc"
+     KERNEL_CC_append_arc = " ${TOOLCHAIN_OPTIONS}"
+     KERNEL_LD_append_arc = " ${TOOLCHAIN_OPTIONS}"
+
+     KERNEL_FEATURES_append_qemuall=" features/debug/printk.scc"
                                 </literallayout>
                                 <note>
                                     Avoiding "+=" and "=+" and using