Update doc/conf.py.

PiperOrigin-RevId: 820636602
Change-Id: I20d8b44f9b933f14a72cb6e394be149bb459c552

Author: thowell

doc/conf.py

@@ -24,6 +24,7 @@
 
 sys.path.insert(0, os.path.abspath('../'))
 sys.path.append(os.path.abspath('ext'))
+sys.path.insert(0, os.path.abspath('../mjx/mujoco/mjx/third_party/mujoco_warp'))
 
 from sphinxcontrib import katex  # pylint: disable=g-import-not-at-top
 from sphinxcontrib import youtube  # pylint: disable=g-import-not-at-top,unused-import