/usr/share/zsh/help/exec is in zsh-common 5.1.1-1ubuntu2.
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 9 | exec [ -cl ] [ -a argv0 ] [ command [ arg ... ] ]
Replace the current shell with an external command rather than
forking. With -c clear the environment; with -l prepend - to
the argv[0] string of the command executed (to simulate a login
shell); with -a argv0 set the argv[0] string of the command exe-
cuted. See the section `Precommand Modifiers' in zshmisc(1).
If command is omitted but any redirections are specified, then
the redirections will take effect in the current shell.
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