.zshrc (maybe other?), printf fails on comments with ' -> #'

[RollingTom]

When generating .zshrc using printf, hooks that contain comments
followed by a single quote (e.g. # ') cause parsing issues.
This breaks shellHook definitions and results in an invalid .zshrc.

example:

shell = "zsh";
shellHook = ''
    #'
''

Right now .zshrc gets written with printf:

printf "%s\n" \
  "export ZDOTDIR=$ZDOTDIR_" \
  'source $ZDOTDIR/.zshrc' \
  '${shellHook}' \
  '${zshHook}' \
  >$ZDOTDIR/.zshrc

Proposed fix
Write the file with a single-quoted heredoc so the body is taken literally, no interpolation, no format processing, no escaping games:

cat >"$ZDOTDIR/.zshrc" <<EOF
export ZDOTDIR=$ZDOTDIR_
source \$ZDOTDIR/.zshrc
\${shellHook}
\${zshHook}
EOF

I know this is a bit nitpicky, but it saves folks from some very confusing failures when a hook happens to contain # '.
Happy to open a PR with tests if that helps!