Remove redundant add action from examples in apt/README.md
Remove redundant add action from examples in apt/README.md

puckel/apt,rockaboxmedia/apt,cookbooks/hw-apt,ortoo/apt,mattray/apt,scalarae/apt,edmunds-chef/apt,brumschlag/apt,jtimberman/apt,whiteley/apt,NREL-cookbooks/apt,protec-cookbooks/apt,portertech/apt,pwnieexpress/apt,lewg/chef-apt,Agiley/apt,gravitystorm/apt,nilsga/apt,tomgl/apt,hw-cookbooks/apt,scalarae/apt,otype/chef,ikkyotech/OpsworksNodeAddons,Altiscale/apt,gswallow/apt,PolicyStat/apt,balmbees/apt,eteeselink/apt,Tealium/apt,BarthV/apt,Banno/apt,trinitronx/apt,cookbooks/nd-chef-opscode-apt,samstokes/apt,Rockstar04/apt,ikkyotech/OpsworksNodeAddons,daptiv/apt,h4ck3rm1k3/apt,Alukardd/cookbook-apt,pwnieexpress/apt,mrdavidlaing/apt,Youscribe/apt,democracyworks/apt,brumschlag/apt,balmbees/apt,wrbooth/apt,CodePen/apt,mchesnut/apt,chef-cookbooks/apt,chrisroberts/apt,patcon/apt,Rockstar04/apt,puckel/apt,tmatilai/chef-apt,adambrett-forks/chef-apt,rackspace-cookbooks/rackspace_apt,andrewgross/apt,Tealium/apt,opscode-cookbooks/apt,knuckolls/apt,BarthV/apt,opscode-cookbooks/apt,edmunds-chef/apt,Altiscale/apt,Shopify/chef-apt,fooforge/apt,ouranos/apt,patcon/apt,VertiPub/apt,aerickson/apt,PolicyStat/apt,yola/apt-cookbook,llaurent/opscode-cookbooks-apt,chef-cookbooks/apt,swistaczek/apt,VertiPub/apt,brocksamson/apt,cookbooks/oc-apt,josephholsten/opscode-cookbooks-apt,h4ck3rm1k3/apt,protec-cookbooks/apt,sabcio/apt,paulschwarz/apt,MarkRoddy/apt,Alukardd/cookbook-apt,MattMencel/apt