Update docs for `--publish-url` to avoid duplication. (#8561)
## Summary
These two sentences in the docs for `--publish-url` seem to basically be
duplicates:
https://github.com/astral-sh/uv/blob/3eda248ef5678fe07b5424fb4f256011800fbb15/crates/uv-cli/src/lib.rs#L4616-L4618
I found the first to be easier to read, so this commit removes the
second.
## Test Plan
No tests, change is docs-only.
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Co-authored-by: Zanie Blue <contact@zanie.dev>
