improve name

Author: RenderMichael

dotnet/src/webdriver/Remote/RemoteSessionSettings.cs

@@ -359,9 +359,9 @@ private string GetDebuggerDisplay()
 
             if (!string.IsNullOrEmpty(browser))
             {
-                return $"Browser = {browser}, Extra driver options count = {this.firstMatchOptions.Count}";
+                return $"Browser = {browser}, Additional Driver Count = {this.firstMatchOptions.Count}";
             }
-            return $"Extra driver options Count = {this.firstMatchOptions.Count}, ";
+            return $"Additional Driver Count = {this.firstMatchOptions.Count}, ";
         }
     }
 }