Fix missing link in the Linux GSG, accidentally removed
in previous merge:
WARNING: undefined label: linux_gsg_compiling_dpdk
Fixes: 29c673401c4d ("doc: improve Linux guide layout")
Signed-off-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>
3b60ce8cbb