Update docs requirements to include IREE.

docs/api_docs/python/requirements.txt

diff --git a/docs/api_docs/python/requirements.txt b/docs/api_docs/python/requirements.txt
index 23a8c34..4d85c3b 100644
--- a/docs/api_docs/python/requirements.txt
+++ b/docs/api_docs/python/requirements.txt
@@ -1,7 +1,11 @@
 sphinx==4.2.0
 myst-parser==0.15.2  # For markdown
-sphinx_material==0.0.34
 sphinx_rtd_theme==1.0.0
 commonmark==0.9.1
 enum_tools==0.6.4
-sphinx_toolbox==2.14.1
+sphinx_toolbox==2.15.0
+
+# IREE Python API
+-f https://github.com/google/iree/releases
+iree-compiler-snapshot
+iree-runtime-snapshot