docs: fixed typos, spaces, and punctuation

[grjan7]

Fixes typos, spaces and punctuation.

[crandmck]

Thanks for the PR @grjan7

Based on what I saw so far, this all looks OK, but I stopped at the edits to the _includes/readmes. These files live in the corresponding repo and are simply copied here using get-readmes.sh.
So, e.g., https://expressjs.com/en/resources/middleware/body-parser.html comes from https://github.com/expressjs/body-parser/blob/master/README.md.

So the files should be edited in each individual repo, not here. There is a notice at the top of each such page on the site:

Note: This page was generated from the xyz README.

We really should explain this somewhere, and it would be way better if it were done in a GitHub workflow instead of manually running a script.

IAC, please remove these files from the PR, and then I'll continue reviewing.
Also, you should know that we plan to remove some pages that are linked from the "Resources" and "Advanced" menus. cf. https://github.com/expressjs/expressjs.com/wiki/Discuss:-Remove-pages-from-docs.
You might want to remove these files from the PR, too. If we land that PR (which doesn't yet exist, but soon will) before you re-submit this one, you'll need to remove them from the PR.

[crandmck]

Remove files in _includes/readmes per comment.

[grjan7]

Ok, @crandmck.

[grjan7]

@crandmck, I have removed those files from PR. You can review them now.

[crandmck]

terminating an Express server.

[grjan7]

Ok.

[crandmck]

Thanks again @grjan7.

Corrections to spelling, punctuation, and formatting are valuable.

Many of the edits in this PR simply removed extra spaces. I don't feel that adds a lot of value. It doesn't do any harm either, so I left them in this PR, but just for future reference.

[grjan7]

Thanks for your input, @crandmck.