ignore boxtree doc error

Author: alexfikl

doc/conf.py

@@ -22,6 +22,10 @@
         "DOFDescriptorLike": "pytential.symbolic.dof_desc.DOFDescriptorLike",
         }
 
+nitpick_ignore_regex = [
+        ["py:class", r"boxtree\.array_context\.(.+)"],
+        ]
+
 intersphinx_mapping = {
     "https://docs.python.org/3/": None,
     "https://numpy.org/doc/stable/": None,