Improve doc string for `actions.run()` `arguments` argument

### Page link:

https://bazel-docs-staging.netlify.app/versions/master/skylark/lib/actions.html#run

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

The `arguments` argument to `actions.run()` says:

> Must be a list of strings or [actions.args()](https://bazel-docs-staging.netlify.app/versions/master/skylark/lib/actions#args) objects.

This confused me for a solid 20 minutes cause I'm not the brightest bulb. I read it as a 'list of strings' or an 'args' object.. while off course it actually means 'a list' of 'strings or args objects'... Maybe it can be disambiguated to:

> Must be a list of strings or a list of [actions.args()](https://bazel-docs-staging.netlify.app/versions/master/skylark/lib/actions#args) objects.

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

The `arguments` argument in the docs right [here](https://bazel-docs-staging.netlify.app/versions/master/skylark/lib/actions#run). The actual doc string in the code is [here](https://github.com/bazelbuild/bazel/blob/master/src/main/java/com/google/devtools/build/lib/starlarkbuildapi/StarlarkActionFactoryApi.java#L580).

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

_No response_

Open src/main/java/com/google/devtools/build/lib/starlarkbuildapi/StarlarkActionFactoryApi.java at the documented arguments entry for actions.run(). Read the current wording and compare it with the linked staging documentation. Done means the text clearly describes a list containing strings or actions.args() objects and the generated documentation reflects that wording.

Written by the indexing model from the issue text.