Context. Two untitled panels force the reader to guess. Each panel gets its own title.
Your task. Write make_titled_grid(revenue, orders) — a 1×2 grid, revenue line left titled exactly "Revenue", orders line right titled exactly "Orders". Return fig, axes.
Example. axes[0].set_title("Revenue") titles just the left panel.
Notes. Panel titles are set on each axes, not on the figure. Exact spelling matters here.