Fix CSharpAccessibilityKeyword doc to list all defaulting cases

Co-authored-by: dex3r <[email protected]>
Agent-Logs-Url: https://github.com/dex3r/EasySourceGenerators/sessions/7c930db8-e3f7-42d9-98cd-41cf86cdc442

Author: Copilot

EasySourceGenerators.Generators/SourceEmitting/CSharpAccessibilityKeyword.cs

@@ -10,7 +10,8 @@ internal static class CSharpAccessibilityKeyword
     /// <summary>
     /// Converts a Roslyn <see cref="Accessibility"/> value to its C# keyword representation.
     /// When <paramref name="defaultToPrivate"/> is <c>true</c> (the default), returns <c>"private"</c>
-    /// for <see cref="Accessibility.Private"/> and unrecognized values.
+    /// for <see cref="Accessibility.Private"/>, <see cref="Accessibility.NotApplicable"/>,
+    /// and any unrecognized values.
     /// When <c>false</c>, returns an empty string instead — useful in contexts where
     /// the <c>private</c> keyword is implicit (e.g., dummy implementations).
     /// </summary>