Added cross-references to NixOS manual

nixos/doc/manual/configuration/linux-kernel.xml

@@ -10,7 +10,7 @@
 the option <option>boot.kernelPackages</option>.  For instance, this
 selects the Linux 3.10 kernel:
 <programlisting>
-boot.kernelPackages = pkgs.linuxPackages_3_10;
+<xref linkend="opt-boot.kernelPackages"/> = pkgs.linuxPackages_3_10;
 </programlisting>
 Note that this not only replaces the kernel, but also packages that
 are specific to the kernel version, such as the NVIDIA video drivers.
@@ -45,23 +45,23 @@ is typically <literal>y</literal>, <literal>n</literal> or
 
 <para>Kernel modules for hardware devices are generally loaded
 automatically by <command>udev</command>.  You can force a module to
-be loaded via <option>boot.kernelModules</option>, e.g.
+be loaded via <xref linkend="opt-boot.kernelModules"/>, e.g.
 <programlisting>
-boot.kernelModules = [ "fuse" "kvm-intel" "coretemp" ];
+<xref linkend="opt-boot.kernelModules"/> = [ "fuse" "kvm-intel" "coretemp" ];
 </programlisting>
 If the module is required early during the boot (e.g. to mount the
 root file system), you can use
-<option>boot.initrd.extraKernelModules</option>:
+<xref linkend="opt-boot.initrd.extraKernelModules"/>:
 <programlisting>
-boot.initrd.extraKernelModules = [ "cifs" ];
+<xref linkend="opt-boot.initrd.extraKernelModules"/> = [ "cifs" ];
 </programlisting>
 This causes the specified modules and their dependencies to be added
 to the initial ramdisk.</para>
 
 <para>Kernel runtime parameters can be set through
-<option>boot.kernel.sysctl</option>, e.g.
+<xref linkend="opt-boot.kernel.sysctl"/>, e.g.
 <programlisting>
-boot.kernel.sysctl."net.ipv4.tcp_keepalive_time" = 120;
+<xref linkend="opt-boot.kernel.sysctl"/>."net.ipv4.tcp_keepalive_time" = 120;
 </programlisting>
 sets the kernel’s TCP keepalive time to 120 seconds.  To see the
 available parameters, run <command>sysctl -a</command>.</para>