adds changelog for more architectures support and fixes a link (nim-l…

…ang#21229)

changelogs/changelog_2_0_0.md

@@ -26,7 +26,7 @@
 - Enabling `-d:nimPreviewSlimSystem` also removes the following deprecated
   symbols in the `system` module:
   - Aliases with `Error` suffix to exception types that have a `Defect` suffix
-    (see [exceptions](https://nim-lang.org/docs/exceptions.html)):
+    (see [exceptions](https://nim-lang.github.io/Nim/exceptions.html)):
     `ArithmeticError`, `DivByZeroError`, `OverflowError`,
     `AccessViolationError`, `AssertionError`, `OutOfMemError`, `IndexError`,
     `FieldError`, `RangeError`, `StackOverflowError`, `ReraiseError`,
@@ -317,6 +317,7 @@
 - Nim now supports `out` parameters and ["strict definitions"](https://nim-lang.github.io/Nim/manual_experimental.html#strict-definitions-and-nimout-parameters).
 - Nim now offers a [strict mode](https://nim-lang.github.io/Nim/manual_experimental.html#strict-case-objects) for `case objects`.
 
+- IBM Z architecture and macOS m1 arm64 architecture are supported.
 
 ## Compiler changes