/usr/share/zsh/help/wait is in zsh-common 5.0.7-5.
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 | wait [ job ... ]
       Wait  for  the specified jobs or processes.  If job is not given
       then all currently active child processes are waited for.   Each
       job can be either a job specification or the process ID of a job
       in the job table.  The exit status from this command is that  of
       the job waited for.
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