doc: specify sh for commands block
doc: specify sh for commands block

rouzier/gopacket,google/gopacket,xuzhaokui/gopacket,google/gopacket,xuzhaokui/gopacket,google/gopacket,levigross/gopacket,rouzier/gopacket,rouzier/gopacket,levigross/gopacket,xuzhaokui/gopacket,levigross/gopacket