Fix CLI reference with code block (#12807)
Due to https://github.com/clap-rs/clap/issues/5900, clap folds docstring
code blocks in a way that breaks the rendering of the `uv publish
--index` option to html. As a workaround, `verbatim_doc_comment`
prevents this.
Release:

PR:

Release:
```
--index <INDEX>
The name of an index in the configuration to use for publishing.
The index must have a `publish-url` setting, for example:
```toml [[tool.uv.index]] name = "pypi" url =
"https://pypi.org/simple" publish-url =
"https://upload.pypi.org/legacy/" ```
The index `url` will be used to check for existing files to skip
duplicate uploads.
With these settings, the following two calls are equivalent:
``` uv publish --index pypi uv publish --publish-url
https://upload.pypi.org/legacy/ --check-url https://pypi.org/simple
```
[env: UV_PUBLISH_INDEX=]
```
PR:
```
--index <INDEX>
The name of an index in the configuration to use for publishing.
The index must have a `publish-url` setting, for example:
```toml
[[tool.uv.index]]
name = "pypi"
url = "https://pypi.org/simple"
publish-url = "https://upload.pypi.org/legacy/"
```
The index `url` will be used to check for existing files to skip
duplicate uploads.
With these settings, the following two calls are equivalent:
```shell
uv publish --index pypi
uv publish --publish-url https://upload.pypi.org/legacy/
--check-url https://pypi.org/simple
```
[env: UV_PUBLISH_INDEX=]
```
Fixes #12652