DOC: Remove pyplot text example

Motivation: This is part of the general approach to consolidate examples.

Why we don't need the pyplot text example:

- We don't have to explicitly discuss mathtext for the case of pyplot
- Title and axkis labels are better described already in the basic plot example
- `plt.text()` is not so common as to justify a specific pyplot example. As with most other functions it's sufficient to have examples for the Axes interface (which for text are in the section "Text, labels and annoations")

Author: timhoffm

galleries/examples/pyplots/pyplot_simple.py

@@ -1,20 +1,30 @@
 """
-===========
-Simple plot
-===========
+==========
+Basic plot
+==========
 
-A simple plot where a list of numbers are plotted against their index,
-resulting in a straight line. Use a format string (here, 'o-r') to set the
-markers (circles), linestyle (solid line) and color (red).
+A basic plot using the ref:`pyplot_interface`.
+
+- `~.pyplot.plot` plots the data y versus x as lines and/or markers.
+- `~.pyplot.title`, `~.pyplot.xlabel` and `~.pyplot.ylabel` set the title,
+  x-axis label and y-axis label.
+- `~.pyplot.show` displays the plot.
 
 .. redirect-from:: /gallery/pyplots/fig_axes_labels_simple
 .. redirect-from:: /gallery/pyplots/pyplot_formatstr
+.. redirect-from:: /gallery/pyplots/pyplot_text
 """
 
 import matplotlib.pyplot as plt
+import numpy as np
+
+x = np.arange(0.0, 2.0, 0.01)
+y = np.sin(2 * np.pi * x)
 
-plt.plot([1, 2, 3, 4], 'o-r')
-plt.ylabel('some numbers')
+plt.plot(x, y)
+plt.title("A basic plot using pyplot")
+plt.xlabel('Time [s]')
+plt.ylabel('Voltage [mV]')
 plt.show()
 
 # %%
@@ -25,5 +35,7 @@
 #    in this example:
 #
 #    - `matplotlib.pyplot.plot`
+#    - `matplotlib.pyplot.title`
+#    - `matplotlib.pyplot.ylabel`
 #    - `matplotlib.pyplot.ylabel`
 #    - `matplotlib.pyplot.show`