More edis of the doctest

Author: kwankyu

src/sage/plot/plot.py

@@ -1741,15 +1741,15 @@ def b(n): return lambda x: bessel_J(n, x) + 0.5*(n-1)
 
     ::
 
-        sage: plot(2*x + 1,(x, 0, 5), ticks=[[0, 1, e, pi, sqrt(20)], [1, 2, 2*e + 1, 2*pi + 1, 2*sqrt(20) + 1]], tick_formatter="latex")
+        sage: plot(2*x + 1,(x, 0, 5), ticks=[[0, 1, e, pi, sqrt(20)], [1, 3, 2*e + 1, 2*pi + 1, 2*sqrt(20) + 1]], tick_formatter="latex")
         Graphics object consisting of 1 graphics primitive
 
     .. PLOT::
 
-        g = plot(2*x + 1,(x, 0, 5), ticks=[[0, 1, e, pi, sqrt(20)], [1, 2, 2*e + 1, 2*pi + 1, 2*sqrt(20) + 1]], tick_formatter="latex")
+        g = plot(2*x + 1,(x, 0, 5), ticks=[[0, 1, e, pi, sqrt(20)], [1, 3, 2*e + 1, 2*pi + 1, 2*sqrt(20) + 1]], tick_formatter="latex")
         sphinx_plot(g)
 
-    This is particularly useful when setting custom ticks in multiples of `pi`.
+    This is particularly useful when setting custom ticks in multiples of `\pi`.
 
     ::