INTPYTHON-625 Fix imports in docs build (#317)

Author: aclark4life

bindings/python/docs/conf.py

@@ -10,8 +10,12 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 #
+import os
+import sys
 from pathlib import Path
 
+sys.path.insert(0, os.path.abspath(".."))  # noqa: PTH100
+
 # -- Project information -----------------------------------------------------
 
 project = "PyMongoArrow"