Update Foreword for V8 (dotnet#1204)

* Update Foreword for V8

* fix md

standard/foreword.md

@@ -1,31 +1,19 @@
 # Foreword
 
-This specification replaces ECMA-334:2022. Changes from the previous edition include the addition of the following:
+This specification replaces ECMA-334:2023. Changes from the previous edition include the addition of the following:
 
-- Binary integer literals
-- Embedded digit separators in numeric literals
-- Leading-digit separators in binary and hexadecimal integer literals
-- `out` variables
-- Discards
-- Tuple types
-- Pattern Matching
-- `ref` locals and returns, conditional `ref` expressions, `ref` with `this` in extension methods, and reassignment of `ref` local variables
-- Local Functions
-- More expression-bodied members
-- `throw` Expressions
-- Generalized `async` return types
-- `async Main` method
-- `default` literal expressions
-- Non-trailing named arguments
-- `private protected` access modifier
-- `in` parameter modifier
-- `readonly` structs
-- `ref` structs
-- Indexing movable fixed buffer without pinning
-- Initializers on `stackalloc` arrays
-- Pattern-based `fixed` statements
-- `System.Delegate` and `System.Enum` as *class_type* constraints.
-- Additional generic constraints
-- Allow expression variables in more locations
-- Attach attributes to the backing field of auto-implemented properties
-- Reduce ambiguity of overload resolution
+- 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
+- ranges and indexes
+- readonly instance members
+- name shadowing in nested functions
+- static local functions
+- ?? Disposable ref structs