Modify Rule S6582: Add link to the rule prefer_null_aware_method_calls

rules/S6582/dart/rule.adoc

@@ -14,22 +14,55 @@ Replace with `?.` `null`-aware operator the logical expression that checks for `
 
 [source,dart,diff-id=1,diff-type=noncompliant]
 ----
-void foo(a) {
+void foo(Bar? bar) {
-    if (a != null) { // Noncompliant
+    var x = bar == null ? null : bar.value; // Noncompliant
-        var x = a.value;
-    }
 }
 ----
 
+[source,dart,diff-id=2,diff-type=noncompliant]
+----
+void foo(Function? function) {
+    if (function != null) function!(); // Noncompliant
+}
+----
+
+
 ==== Compliant solution
 
 [source,dart,diff-id=1,diff-type=compliant]
 ----
-void foo(a) {
+void foo(Bar? bar) {
-    var x = a?.value;
+    var x = bar?.value;
+}
+----
+
+[source,dart,diff-id=2,diff-type=compliant]
+----
+void foo(Function? function) {
+    function?.call();
 }
 ----
 
 == Resources
 
-* https://dart.dev/tools/linter-rules/prefer_null_aware_operators[Dart Lint rule]
+* Dart Docs - https://dart.dev/tools/linter-rules/prefer_null_aware_operators[Dart Linter rule -  prefer_null_aware_operators]
+* Dart Docs - https://dart.dev/tools/linter-rules/prefer_null_aware_method_calls[Dart Linter rule -  prefer_null_aware_method_calls]
+
+ifdef::env-github,rspecator-view[]
+
+'''
+== Implementation Specification
+(visible only on this page)
+
+=== Message
+
+* "Use the '??' operator rather than '?:' when testing for 'null'."
+* Use a null-aware invocation of the 'call' method rather than explicitly testing for 'null'.
+
+=== Highlighting
+
+The whole ternary operator or if-statement
+
+'''
+
+endif::env-github,rspecator-view[]