add news for #26858 and #26859 [ci skip]

NEWS.md

@@ -459,6 +459,12 @@ This section lists changes that do not have deprecation warnings.
   * `parse(::Type, ::Char)` now uses a default base of 10, like other number parsing
     methods, instead of 36 ([#26576]).
 
+  * `isequal` for `Ptr`s now compares element types; `==` still compares only addresses
+    ([#26858]).
+
+  * `widen` on 8- and 16-bit integer types now widens to the platform word size (`Int`)
+    instead of to a 32-bit type ([#26859]).
+
 Library improvements
 --------------------