DOC: Add dateutil to intersphinx #24437 (#24443)

Author: benjaminr

doc/source/conf.py

@@ -371,13 +371,14 @@
 
 
 intersphinx_mapping = {
-    'statsmodels': ('http://www.statsmodels.org/devel/', None),
+    'dateutil': ("https://dateutil.readthedocs.io/en/latest/", None),
     'matplotlib': ('https://matplotlib.org/', None),
+    'numpy': ('https://docs.scipy.org/doc/numpy/', None),
     'pandas-gbq': ('https://pandas-gbq.readthedocs.io/en/latest/', None),
+    'py': ('https://pylib.readthedocs.io/en/latest/', None),
     'python': ('https://docs.python.org/3/', None),
-    'numpy': ('https://docs.scipy.org/doc/numpy/', None),
     'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
-    'py': ('https://pylib.readthedocs.io/en/latest/', None)
+    'statsmodels': ('http://www.statsmodels.org/devel/', None),
 }
 import glob
 autosummary_generate = glob.glob("*.rst")