Apply suggestions from code review

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Author: Tortar

doc/users/next_whats_new/Allow positioning of text inside TextBox.rst

@@ -1,16 +1,13 @@
 Text can be positioned inside TextBox widget
----------------------
+--------------------------------------------
 
-A new parameter called ``textalignment`` can be used to control for the position of the text inside the Axes of the TextBox widget.
+A new parameter called *textalignment* can be used to control for the position of the text inside the Axes of the TextBox widget.
 
-Example :
-
-.. code-block::
+.. plot::
 
   from matplotlib import pyplot as plt
   from matplotlib.widgets import TextBox
 
-  Box_input = plt.axes([0.2, 0.2, 0.1, 0.075])
-  text_box = TextBox(ax=Box_input, initial="text", label="", textalignment="center")
-
+  box_input = plt.axes([0.2, 0.2, 0.1, 0.075])
+  text_box = TextBox(ax=box_input, initial="text", label="", textalignment="center")