/usr/share/zsh/help/shift is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | 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.
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