/usr/share/zsh/help/fg is in zsh-common 5.3.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | fg [ job ... ]
job ...
Bring each specified job in turn to the foreground. If no job
is specified, resume the current job.
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