Merge pull request matplotlib#29902 from meeseeksmachine/auto-backport-of-pr-29899-on-v3.10.x

Backport PR matplotlib#29899 on branch v3.10.x ([doc] minimally document what basic units is doing)

Author: QuLogic

galleries/examples/units/basic_units.py

@@ -5,6 +5,14 @@
 Basic units
 ===========
 
+
+This file implements a units library that supports registering arbitrary units,
+conversions between units, and math with unitized data. This library also implements a
+Matplotlib unit converter and registers its units with Matplotlib. This library is used
+in the examples to demonstrate Matplotlib's unit support. It is only maintained for the
+purposes of building documentation and should never be used outside of the Matplotlib
+documentation.
+
 """
 
 import itertools