Merge pull request matplotlib#30667 from star1327p/correct-typos

DOC: Correct typos: lets -> let's [ci docs]

Author: timhoffm

lib/matplotlib/tests/test_dates.py

@@ -275,7 +275,7 @@ def test_DateFormatter():
     import matplotlib.testing.jpl_units as units
     units.register()
 
-    # Lets make sure that DateFormatter will allow us to have tick marks
+    # Let's make sure that DateFormatter will allow us to have tick marks
     # at intervals of fractional seconds.
 
     t0 = datetime.datetime(2001, 1, 1, 0, 0, 0)

lib/matplotlib/tests/test_sankey.py

@@ -6,7 +6,7 @@
 
 
 def test_sankey():
-    # lets just create a sankey instance and check the code runs
+    # let's just create a sankey instance and check the code runs
     sankey = Sankey()
     sankey.add()