docs: removed reference for nginx.
docs: removed reference for nginx.

realted to #489.

jblancett/tsuru,jblancett/tsuru,RichardKnop/tsuru,gciotta/tsuru,ggarnier/tsuru,gciotta/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,ggarnier/tsuru,hcxiong/tsuru,ArxdSilva/tsuru,ArxdSilva/tsuru,firebitsbr/tsuru,firebitsbr/tsuru,kgrvamsi/tsuru,guilhermebr/tsuru,tuxmonteiro/tsuru,4eek/tsuru,mderaldo/tsuru,RichardKnop/tsuru,tsuru/tsuru,ArxdSilva/tsuru,mderaldo/tsuru,ggarnier/tsuru,Endika/tsuru,cgvarela/tsuru,guilhermebr/tsuru,jblancett/tsuru,cezarsa/tsuru,4eek/tsuru,cezarsa/tsuru,Endika/tsuru,hugoantunes/tsuru,4eek/tsuru,mderaldo/tsuru,tuxmonteiro/tsuru,cezarsa/tsuru,tsuru/tsuru,RichardKnop/tsuru,gwmoura/tsuru,tsuru/tsuru,tuxmonteiro/tsuru,guilhermebr/tsuru,tsuru/tsuru,ggarnier/tsuru,firebitsbr/tsuru,cgvarela/tsuru,gwmoura/tsuru,hcxiong/tsuru,hugoantunes/tsuru,cgvarela/tsuru,kgrvamsi/tsuru,gciotta/tsuru,kgrvamsi/tsuru,hcxiong/tsuru,cezarsa/tsuru,guilhermebr/tsuru,Endika/tsuru