doc: guidelines for library statistics
doc: guidelines for library statistics

Signed-off-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>
Acked-by: John McNamara <af31595c36a4239b9676e9b3a777d3e2f15a6c4d@intel.com>

tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,mixja/dpdk,mixja/dpdk,tsphillips/dpdk-fork,venkynv/dpdk-mirror,mixja/dpdk,venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,msune/dpdk,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,msune/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,msune/dpdk,mixja/dpdk