dev-cmd/man: use SOURCE_PATH instead of HOMEBREW_LIBRARY
dev-cmd/man: use SOURCE_PATH instead of HOMEBREW_LIBRARY

Don't Repeat Yourself.

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