docs/releases/tsuru-admin: remove "under development warning"
docs/releases/tsuru-admin: remove "under development warning"

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