New-Maintainer-Checklist: make some tweaks.
New-Maintainer-Checklist: make some tweaks.

- there are obligations on becoming a maintainer so firm these up a bit
- make clear there's a trial period after being invited to be a
  maintainer.

Linuxbrew/brew,DomT4/brew,sjackman/homebrew,alyssais/brew,reitermarkus/brew,nandub/brew,claui/brew,nandub/brew,konqui/brew,reelsense/brew,vitorgalvao/brew,Homebrew/brew,mgrimes/brew,mgrimes/brew,maxim-belkin/brew,maxim-belkin/brew,sjackman/homebrew,hanxue/linuxbrew,reitermarkus/brew,hanxue/linuxbrew,reelsense/brew,EricFromCanada/brew,mahori/brew,Linuxbrew/brew,mgrimes/brew,vitorgalvao/brew,mahori/brew,MikeMcQuaid/brew,JCount/brew,reelsense/brew,sjackman/homebrew,konqui/brew,pseudocody/brew,claui/brew,ilovezfs/brew,pseudocody/brew,vitorgalvao/brew,pseudocody/brew,ilovezfs/brew,Linuxbrew/brew,konqui/brew,EricFromCanada/brew,alyssais/brew,claui/brew,aw1621107/brew,nandub/brew,reitermarkus/brew,claui/brew,aw1621107/brew,Homebrew/brew,EricFromCanada/brew,DomT4/brew,aw1621107/brew,sjackman/homebrew,reitermarkus/brew,Linuxbrew/brew,vitorgalvao/brew,nandub/brew,alyssais/brew,mahori/brew,EricFromCanada/brew,JCount/brew,MikeMcQuaid/brew,maxim-belkin/brew,Homebrew/brew,mahori/brew,MikeMcQuaid/brew,Homebrew/brew,DomT4/brew,konqui/brew,JCount/brew,hanxue/linuxbrew,ilovezfs/brew,MikeMcQuaid/brew,DomT4/brew,JCount/brew