[DOC] Add back Rust 1.85.0 requirement to NEWS.md (#15728)

* [DOC] Add back Rust 1.85.0 requirement to NEWS.md

Addresses k0kubun's review in https://github.com/ruby/ruby/pull/15711#issuecomment-3690541074

NEWS.md serves both CRuby developers as well as end-users. As the
release date closes in, it probably gets seen by more users than
core developers (on the blog for example).

Most users probably don't build Ruby by hand, and instead that is
abstracted through tools like ruby-install or a package manager.
For some users these tools may install pre-built binaries where
they exist, in which case the Rust requirement doesn't apply. In
other instances, the tools merely automate the build, in which case
the correct rustc version is required to enable support.

It is also a little confusing to talk about "enabling support for
the JIT during the build" vs "enabling the JIT at runtime".

This copy attempts to balance all of the above and hopefully gets
the correct points across all intended audiences.

* Apply suggestion from k0kubun

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

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Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

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