Refactor messages and documentation for bot.json -> bot.yaml

CodegenBot/ProvidedSchemaUtility.cs

@@ -17,7 +17,7 @@ public static class ProvidedSchemaUtility
     /// and once the bot.yaml file is found, reads the providedSchema field from it. That providedSchema field is a path
     /// to where we should write the GraphQL schema that this bot implements.
     /// </summary>
-    /// <param name="directory">The directory to start searching in for bot.json. If null, defaults to the current working directory.</param>
+    /// <param name="directory">The directory to start searching in for bot.yaml. If null, defaults to the current working directory.</param>
     /// <returns>The absolute path to where we should write the providedSchema file, if bot.yaml is found and the providedSchema field is in it.</returns>
     public static string? CalculateProvidedSchemaPath(string? directory = null)
     {
@@ -42,7 +42,7 @@ public static class ProvidedSchemaUtility
 
         if (botSpec is null)
         {
-            Console.WriteLine("Can't read bot.json");
+            Console.WriteLine("Can't read bot.yaml");
             return null;
         }