Tweak codefix action

Author: andrewlock

src/StronglyTypedIds/Diagnostics/UnknownTemplateCodeFixProvider.cs

@@ -77,7 +77,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
 
             context.RegisterCodeFix(
                 CodeAction.Create(
-                    $"Add {templateName}.typedid template to the project",
+                    $"Add '{templateName}.typedid' template to the project",
                     cancellationToken => GetTransformedSolutionAsync(context.Document, templateName, cancellationToken),
                     nameof(UnknownTemplateCodeFixProvider)),
                 diagnostic);