Tracking issue for release notes of #128259: [illumos/solaris] set MSG_NOSIGNAL while writing to sockets

[rustbot]

This issue tracks the release notes text for #128259.

• Issue is nominated for the responsible team (and T-release nomination is removed).
• Proposed text is drafted by team responsible for underlying change.
• Issue is nominated for release team review of clarity for wider audience.
• Release team includes text in release notes/blog posts.

Release notes text:

The section title will be de-duplicated by the release team with other release notes issues.
Prefer to use the standard titles from previous releases.
More than one section can be included if needed.

# Compatibility Notes
- [illumos/Solaris now sets `MSG_NOSIGNAL` when writing to sockets](https://github.com/rust-lang/rust/pull/128259). This avoids killing the process with SIGPIPE when writing to a closed socket, which matches the existing behavior on other UNIX targets.

Release blog section (if any, leave blank if no section is expected):

[Amanieu]

I've clarified the compat note.

[sunshowers]

Thanks! A couple of minor notes:

1. "illumos" is always lowercase
2. "socked" should be "socket"

[Amanieu]

Thanks, fixed.