src/sage/dynamics/arithmetic_dynamics/wehlerK3.py: Fix bad use of line continuation

Author: kwankyu

src/sage/dynamics/arithmetic_dynamics/wehlerK3.py

@@ -474,7 +474,7 @@ def Qxa(self, a):
            sage: Z = x0^2*y0^2 + 3*x0*x1*y0^2 + x1^2*y0^2 + 4*x0^2*y0*y1 + 3*x0*x1*y0*y1 \
            - 2*x2^2*y0*y1 - x0^2*y1^2 + 2*x1^2*y1^2 - x0*x2*y1^2 - 4*x1*x2*y1^2 \
            + 5*x0*x2*y0*y2 \
-           - 4*x1*x2*y0*y2 + 7*x0^2*y1*y2 + 4*x1^2*y1*y2 + x0*x1*y2^2 + 3*x2^2*y2^2 \
+           - 4*x1*x2*y0*y2 + 7*x0^2*y1*y2 + 4*x1^2*y1*y2 + x0*x1*y2^2 + 3*x2^2*y2^2
            sage: Y = x0*y0 + x1*y1 + x2*y2
            sage: X = WehlerK3Surface([Z, Y])
            sage: T = PP(1, 1, 0, 1, 0, 0)