internal: Document the ':regular' state.
internal: Document the ':regular' state.

m0vie/zsh-syntax-highlighting,phy1729/zsh-syntax-highlighting,psprint/zsh-syntax-highlighting,stuha/wbr-zsh,danielshahaf/zsh-syntax-highlighting-debian,phy1729/zsh-syntax-highlighting,joshuarubin/dotfiles,m0vie/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,psprint/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting-debian,zsh-users/zsh-syntax-highlighting,joshuarubin/dotfiles,zsh-users/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,joshuarubin/dotfiles,joshuarubin/dotfiles,P71/zsh-syntax-highlighting