Improve documentation clarity

Author: sharwell

documentation/SA1129.md

@@ -45,8 +45,10 @@ should always be created using the syntax `default(T)` instead.
 
 To fix a violation of this rule, replace the syntax `new T()` with the equivalent syntax `default(T)`.
 
-For native-sized integers, the code fix will use `IntPtr.Zero`/`UIntPtr.Zero` when the project targets C# 11 with
-runtime support for native-sized integers (e.g. .NET 7 or later), and `default(nint)`/`default(nuint)` otherwise.
+For native-sized integers constructed with `new nint()`/`new nuint()`, the code fix will only use
+`IntPtr.Zero`/`UIntPtr.Zero` in projects where this has the same meaning, specifically, C# 11 with
+runtime support for native-sized integers (e.g. .NET 7 or later). Otherwise, the code fix will use
+`default(nint)`/`default(nuint)` to ensure identical behavior to the original code.
 
 ## How to suppress violations