Fix/10598 nginx comment in multiline directive (#10651)

Fixes #10598.

## Pull Request Checklist

- [x] The Certbot team has recently expressed interest in reviewing a PR
for this. If not, this PR may be closed due our limited resources and
need to prioritize how we spend them.
- [x] If you used AI to create this PR, you have done a self-review of
all AI-generated code and disclosed that your contribution was
AI-generated per [EFF's AI-generated contribution
policy](https://www.eff.org/about/opportunities/volunteer/coding-with-eff).
You assert you have thoroughly understood, reviewed, and tested your
entire submission.
- [x] If the change being made is to a [distributed
component](https://certbot.eff.org/docs/contributing.html#code-components-and-layout),
add a description of your change to the `newsfragments` directory. This
should be a file called `<title>.<type>`, where `<title>` is either a
GitHub issue number or some other unique name starting with `+`, and
`<type>` is either `changed`, `fixed`, or `added`.
* For example, if you fixed a bug for issue number 42, create a file
called `42.fixed` and put a description of your change in that file.
- [x] Add or update any documentation as needed to support the changes
in this PR.
- [x] Include your name in `AUTHORS.md` if you like.

newsfragments/10598.fixed

@@ -0,0 +1 @@
+Fixed nginx configuration parsing when comments appear between tokens of a multi-line directive.