NEWS.md: clarify --trim (JuliaLang#56460)

Co-authored-by: Matt Bauman <[email protected]>

Author: lassepe

NEWS.md

@@ -4,8 +4,8 @@ Julia v1.12 Release Notes
 New language features
 ---------------------
 
-- New option `--trim` for building "trimmed" binaries, where code not provably reachable from entry points
-  is removed. Entry points can be marked using `Base.Experimental.entrypoint` ([#55047]).
+- New option `--trim` creates smaller binaries by removing code that was not proven to be reachable from
+  the entry points. Entry points can be marked using `Base.Experimental.entrypoint` ([#55047]).
 - A new keyword argument `usings::Bool` has been added to `names`. By using this, we can now
   find all the names available in module `A` by `names(A; all=true, imported=true, usings=true)`. ([#54609])
 - the `@atomic(...)` macro family supports now the reference assignment syntax, e.g.