/usr/share/zsh/help/eval 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 | eval [ arg ... ]
Read the arguments as input to the shell and execute the result-
ing command(s) in the current shell process. The return status
is the same as if the commands had been executed directly by the
shell; if there are no args or they contain no commands (i.e.
are an empty string or whitespace) the return status is zero.
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