Fix node names of submenu items across the editor

Also removes some programmer remarks and fixes some docs.

modules/mono/editor/GodotTools/GodotTools/GodotSharpEditor.cs

@@ -497,7 +497,10 @@ namespace GodotTools
 
             AddChild(new HotReloadAssemblyWatcher { Name = "HotReloadAssemblyWatcher" });
 
-            _menuPopup = new PopupMenu();
+            _menuPopup = new PopupMenu
+            {
+                Name = "CSharpTools",
+            };
             _menuPopup.Hide();
 
             AddToolSubmenuItem("C#", _menuPopup);