move news to breaking section

Author: stevengj

NEWS.md

@@ -73,6 +73,9 @@ This section lists changes that do not have deprecation warnings.
     longer present. Use `first(R)` and `last(R)` to obtain
     start/stop. ([#20974])
 
+  * `isapprox(x,y)` now tests `norm(x-y) <= max(atol, rtol*max(norm(x), norm(y)))`
+    rather than `norm(x-y) <= atol + ...` ([#22742]).
+
   * The `Diagonal` type definition has changed from `Diagonal{T}` to
     `Diagonal{T,V<:AbstractVector{T}}` ([#22718]).
 
@@ -132,9 +135,6 @@ Library improvements
   * `@test isequal(x, y)` and `@test isapprox(x, y)` now prints an evaluated expression when
     the test fails ([#22296]).
 
-  * `isapprox(x,y)` now tests `norm(x-y) <= max(atol, rtol*max(norm(x), norm(y)))`
-    rather than `norm(x-y) <= atol + ...`.
-
   * Uses of `Val{c}` in `Base` has been replaced with `Val{c}()`, which is now easily
     accessible via the `@pure` constructor `Val(c)`. Functions are defined as
     `f(::Val{c}) = ...` and called by `f(Val(c))`. Notable affected functions include: