docs: improve Keg.find_some_installed_dependencies
docs: improve Keg.find_some_installed_dependencies

See https://github.com/Homebrew/brew/pull/1752#discussion_r94257147

gregory-nisbet/brew,jmsundar/brew,mahori/brew,muellermartin/dist,konqui/brew,reitermarkus/brew,zmwangx/brew,pseudocody/brew,aw1621107/brew,reelsense/brew,vitorgalvao/brew,vitorgalvao/brew,pseudocody/brew,vitorgalvao/brew,maxim-belkin/brew,alyssais/brew,claui/brew,Linuxbrew/brew,MikeMcQuaid/brew,Homebrew/brew,amar-laksh/brew_sudo,JCount/brew,DomT4/brew,Linuxbrew/brew,rwhogg/brew,DomT4/brew,sjackman/homebrew,mgrimes/brew,claui/brew,gregory-nisbet/brew,DomT4/brew,pseudocody/brew,reelsense/brew,claui/brew,bfontaine/brew,mgrimes/brew,zmwangx/brew,tonyg/homebrew,claui/brew,muellermartin/dist,nandub/brew,mahori/brew,amar-laksh/brew_sudo,nandub/brew,palxex/brew,palxex/brew,konqui/brew,maxim-belkin/brew,EricFromCanada/brew,palxex/brew,Homebrew/brew,Homebrew/brew,MikeMcQuaid/brew,reitermarkus/brew,DomT4/brew,hanxue/linuxbrew,konqui/brew,aw1621107/brew,Homebrew/brew,gregory-nisbet/brew,vitorgalvao/brew,MikeMcQuaid/brew,tonyg/homebrew,reitermarkus/brew,rwhogg/brew,konqui/brew,tonyg/homebrew,mahori/brew,Linuxbrew/brew,aw1621107/brew,EricFromCanada/brew,ilovezfs/brew,hanxue/linuxbrew,JCount/brew,bfontaine/brew,alyssais/brew,jmsundar/brew,zmwangx/brew,hanxue/linuxbrew,jmsundar/brew,maxim-belkin/brew,EricFromCanada/brew,JCount/brew,nandub/brew,bfontaine/brew,mahori/brew,ilovezfs/brew,sjackman/homebrew,Linuxbrew/brew,JCount/brew,nandub/brew,reelsense/brew,sjackman/homebrew,mgrimes/brew,rwhogg/brew,EricFromCanada/brew,sjackman/homebrew,amar-laksh/brew_sudo,alyssais/brew,ilovezfs/brew,MikeMcQuaid/brew,muellermartin/dist,reitermarkus/brew