sphinxdocs: make Any and object types no-ops to avoid missing xrefs (#2905)

The "Any" and "object" types are useful in expression starlark types,
but aren't actually
real things. Treat them like None and make them no-ops so they aren't
treated like
missing xrefs.

sphinxdocs/src/sphinx_bzl/bzl.py

diff --git a/sphinxdocs/src/sphinx_bzl/bzl.py b/sphinxdocs/src/sphinx_bzl/bzl.py
index 4468ec6..8303b4d 100644
--- a/sphinxdocs/src/sphinx_bzl/bzl.py
+++ b/sphinxdocs/src/sphinx_bzl/bzl.py
@@ -1766,6 +1766,11 @@
     # There's no Bazel docs for None, so prevent missing xrefs warning
     if node["reftarget"] == "None":
         return contnode
+
+    # Any and object are just conventions from Python, but useful for
+    # indicating what something is in Starlark, so treat them specially.
+    if node["reftarget"] in ("Any", "object"):
+        return contnode
     return None