Add diff and extend examples

rules/S3878/csharp/rule.adoc

@@ -8,37 +8,47 @@ Creating an array or using a collection expression solely for the purpose of pas
 
 ==== Noncompliant code example
 
-[source,csharp]
+[source,csharp,diff-id=1,diff-type=noncompliant]
 ----
 public void Base() 
 {
-    Method(new string[] { "s1", "s2" }); // Noncompliant: unnecessary
-    Method(new string[] { });            // Noncompliant
-    Method(["s3", "s4"]);                // Noncompliant
-    Method(new string[12]);              // Compliant
+    Method(new string[] { "s1", "s2" }); // Noncompliant: resolves to string[] overload
+    Method(new string[] { });            // Noncompliant: resolves to string[] overload
+    Method(["s3", "s4"]);                // Noncompliant: resolves to ReadOnlySpan overload
+    Method(new string[12]);              // Compliant: resolves to string[] overload 
 }
-==== Compliant solution
+
 public void Method(params string[] args)
 {
     // ...
 }
+
+public void Method(params ReadOnlySpan<string> args) // C# 13 params collections
+{
+    // C# 13 params collection
+}
 ----
 
 === Compliant solution
 
-[source,csharp]
+[source,csharp,diff-id=1,diff-type=compliant]
 ----
 public void Base()
 {
-    Method("s1", "s2");
-    Method();
-    Method("s3", "s4");
-    Method(new string[12]);
+    Method("s1", "s2");     // resolves to ReadOnlySpan overload
+    Method();               // resolves to ReadOnlySpan overload
+    Method("s3", "s4");     // resolves to ReadOnlySpan overload
+    Method(new string[12]); // resolves to string[]  overload
 }
 
 public void Method(params string[] args)
 {
-    // ...
+    // ..
+}
+
+public void Method(params ReadOnlySpan<string> args) // C# 13 params collections
+{
+    // ..
 }
 ----