Location user's build state with `sudo` unclear from documentation

### Page link:

https://bazel.build/remote/output-directories

### Problem description (include actual vs expected text, if applicable):

The [docs](https://bazel.build/remote/output-directories) state:

> The Bazel user's build state is located beneath `outputRoot/_bazel_$USER`. This is called the _outputUserRoot_ directory.

However, this does not seem to be correct.

```
echo $USER
bart
sudo echo $USER
bart
bazel info output_path
/home/bart/.cache/bazel/_bazel_bart/789d3790deff466599799bacb2b9d927/execroot/Maplibre/bazel-out
sudo bazel info output_path
/root/.cache/bazel/_bazel_root/789d3790deff466599799bacb2b9d927/execroot/Maplibre/bazel-out
```

Notice the output path differs and is `_bazel_bart` instead of `_bazel_root` when using `sudo`.

### Where do you see this issue? (include link to specific section of the page, if applicable)

https://bazel.build/remote/output-directories#layout

### Any other information you'd like to share?

_No response_

Start with the Layout section of https://bazel.build/remote/output-directories and compare its outputRoot and outputUserRoot wording with the sudo and non-sudo examples in this issue. Update the documentation to explain the differing user-specific paths, then verify that the documented behavior matches both commands.

Written by the indexing model from the issue text.