Improve and fix some documents (#8749)

<!--
Thank you for contributing to uv! To help us out with reviewing, please
consider the following:

- Does this pull request include a summary of the change? (See below.)
- Does this pull request include a descriptive title?
- Does this pull request include references to any relevant issues?
-->

## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

## Test Plan

<!-- How was it tested? -->

CONTRIBUTING.md

@@ -200,7 +200,7 @@ Releases can only be performed by Astral team members.
 
 Changelog entries and version bumps are automated. First, run:
 
-```
+```shell
 ./scripts/release.sh
 ```
 

README.md

@@ -285,8 +285,8 @@ for Windows support.
 uv is licensed under either of
 
 - Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
-  https://www.apache.org/licenses/LICENSE-2.0)
-- MIT license ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)
+  <https://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
 
 at your option.
 

STYLE.md

@@ -122,7 +122,7 @@ The documentation is divided into:
 
 ### Warnings
 
-1. `warn_user` and `warn_user_once` are shown without the `--verbose `flag.
+1. `warn_user` and `warn_user_once` are shown without the `--verbose` flag.
    - These methods should be preferred over tracing warnings when the warning is actionable.
    - Deprecation warnings should use these methods.
 1. Deprecation warnings must be actionable.