Merge pull request matplotlib#29821 from anntzer/bt

Tweak minimal checks for GUI binding installs.

Author: timhoffm

galleries/users_explain/figure/backends.rst

@@ -292,14 +292,12 @@ program that can be run to test basic functionality.  If this test fails, try re
 QtAgg, QtCairo, Qt5Agg, and Qt5Cairo
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Test ``PyQt5``.
-
-If you have ``PySide`` or ``PyQt6`` installed rather than ``PyQt5``, just change the import
-accordingly:
+Test ``PyQt6`` (if you have ``PyQt5``, ``PySide2`` or ``PySide6`` installed
+rather than ``PyQt6``, just change the import accordingly):
 
 .. code-block:: bash
 
-   python -c "from PyQt5.QtWidgets import *; app = QApplication([]); win = QMainWindow(); win.show(); app.exec()"
+   python3 -c "from PyQt6.QtWidgets import *; app = QApplication([]); win = QMainWindow(); win.show(); app.exec()"
 
 
 TkAgg and TkCairo
@@ -325,14 +323,9 @@ wxAgg and wxCairo
 
 Test ``wx``:
 
-.. code-block:: python3
-
-   import wx
+.. code-block:: bash
 
-   app = wx.App(False)  # Create a new app, don't redirect stdout/stderr to a window.
-   frame = wx.Frame(None, wx.ID_ANY, "Hello World") # A Frame is a top-level window.
-   frame.Show(True)     # Show the frame.
-   app.MainLoop()
+   python3 -c "import wx; app = wx.App(); frame = wx.Frame(None); frame.Show(); app.MainLoop()"
 
 If the test works for your desired backend but you still cannot get Matplotlib to display a figure, then contact us (see
 :ref:`get-help`).