Update app/materials_library.py

app/materials_library.py

@@ -1397,7 +1397,7 @@ def display_materials_help():
     **Fenestrations Tab:**
     
     * **Library Fenestrations**: Pre-defined windows, doors, and skylights. Use 'Preview' to view details or 'Copy' to add to your project.
-    * **Project Fenestrations**: Fenestrations you've added to your project. Use 'Edit' to modify or 'Delete' to remove.
+    * **Project Fenestrations**: Fenestrations you have added to your project. Use 'Edit' to modify or 'Delete' to remove.
     * **Fenestration Editor/Creator**: Create new fenestrations or edit existing project fenestrations. Library fenestrations can only be previewed.
     
     **Key Properties:**