make_docs.nu: fix flags code to only add short_flag when needed

[paulie4]

NOTE: I ran the script in a separate commit ffbe438, so anyone who wants to can look at what it output, but I can undo the commit if this PR should only include the change to make_docs.nu and not the changes to the generated files.

[hustcer]

Thanks for the fix, It looks like nu_plugin_formats and nu_plugin_polars haven't been added while generating the docs?

[paulie4]

I used brew install nushell to install Nushell in my Windows WSL Ubuntu, and the formula code nushell.rb in GitHub looks like it first does a cargo install of nushell then does a glob("crates/nu_plugin_*") to cargo install each of those, so I don't know why the two plugins you mentioned would be missing.

Although, as I mentioned in my PR description, I really only included the results of my running of make_docs.nu so people could see what it produces for the files that I was able to generate. Do you guys not have a standard Docker image you use for ensuring consistent results of running make_docs.nu?

To make it clearer, I just pushed another commit that undoes that commit, so this PR will just be the changes to make_docs.nu, and people can look at the ffbe438 commit if they want to see how the changes generated cleaner flags without the confusing , -.

[hustcer]

Thanks, BTW: you can try the docker images here: https://github.com/nushell/nushell/pkgs/container/nushell