Grammar.

samples/KristofferStrube.Blazor.Window.WasmExample/Pages/Messages.razor

@@ -9,7 +9,7 @@
 <h2>Messages</h2>
 
 <p>
-    Different windows can send message to each other if they are related to each other.
+    Different windows can send messages to each other if they are related.
     This includes active windows from the same domain, service workers associated to the same domain, and windows hosted by other windows like pop-ups and iframes.
     <br />
     On this page we have subscribed to messages posted to this window and any other windows that it will host.