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/usr/share/zsh/help/shift is in zsh-common 5.3.1-4.

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shift [ -p ] [ n ] [ name ... ]
       The positional parameters ${n+1} ...  are  renamed  to  $1  ...,
       where  n is an arithmetic expression that defaults to 1.  If any
       names are given then the arrays with  these  names  are  shifted
       instead of the positional parameters.

       If the option -p is given arguments are instead removed (popped)
       from the end rather than the start of the array.