audit: recommend use of assert_match.
audit: recommend use of assert_match.

It produces significantly easier output to debug than doing `assert` and
`.include?` (which just shows if it passed or failed).

Closes Homebrew/homebrew#41662.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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