Update docs for --publish-url to avoid duplication.

[nathanjmcdougall]

Summary

These two sentences in the docs for --publish-url seem to basically be duplicates:

uv/crates/uv-cli/src/lib.rs

Lines 4616 to 4618 in 3eda248

	/// Defaults to PyPI's publish URL (<https://upload.pypi.org/legacy/>).
	///
	/// The default value is publish URL for PyPI (<https://upload.pypi.org/legacy/>).

I found the first to be easier to read, so this commit removes the second.

Test Plan

No tests, change is docs-only.

[zanieb]

Thanks!