Update foreword.md

Author: RexJaeschke

standard/foreword.md

@@ -1,20 +1,19 @@
 # Foreword
 
-This specification replaces ECMA-334:2023. Changes from the previous edition include the addition of the following features:
+This specification replaces ECMA-334:2026. Changes from the previous edition include the addition of the following features:
 
-- enhanced interpolated verbatim strings
-- asynchronous streams
-- `using` declarations and `async using`
-- generic method override with constraints
-- unmanaged constructed types
-- default member implementations in interfaces
-- permit `stackalloc` in nested contexts
-- `notnull` constraint
-- null coalescing assignment
-- nullable reference types
-- positional, property, and discard patterns
-- ranges and indexes
-- readonly instance members
-- name shadowing in nested functions
-- static local functions
-- Disposable ref structs
+- `record class` as an alias for `record`
+- record structs
+- Record types can seal `ToString`
+- Enhanced `#line` directives
+- `CallerArgumentExpression` attribute for diagnostics
+- Interpolated string handler 
+- Constant interpolated strings
+- File Scoped Namespaces
+- Allow `AsyncMethodBuilder` attribute on methods
+- Assignment and declaration in the same deconstruction
+- Improved definite assignment
+- Lambda expression improvements
+- Extended property patterns
+- Global using directives
+- Improvements to structure types