Gallery example "Quoted lines": Fix typo (#3539)

examples/gallery/lines/quoted_lines.py

@@ -76,7 +76,7 @@
 # For curved labels following the line, append ``"+v"`` to the argument passed
 # to the ``style`` parameter.
 
-# Generate sinus curve
+# Generate sine curve
 x = np.arange(0, 10 * np.pi, 0.1)
 y = np.sin(0.8 * x)