(Fixes OSS CI) Have Sphinx track deprecated_transform_mixin, but ma…

…ke it private (#2330)

Summary:
Pull Request resolved: #2330

The OSS CI is failing: https://github.com/facebook/Ax/actions/runs/8581833037/job/23519269134?pr=2329

This should fix the Sphinx error. Adding `:meta private:` to the docstring will stop it from rendering, since OSS users shouldn't need to know about `DeprecatedTransformMixin` and can read the code on GH if they need to.

Reviewed By: Balandat

Differential Revision: D55837917

fbshipit-source-id: 9307d7e0795f5e8652ea9c1c9834be054bf2ad8e

ax/modelbridge/transforms/deprecated_transform_mixin.py

@@ -25,6 +25,8 @@ class DeprecatedTransformMixin:
 
     class DeprecatedTransform(DeprecatedTransformMixin, NewTransform):
         ...
+
+    :meta private:
     """
 
     def __init__(self, *args: Any, **kwargs: Any) -> None:

sphinx/source/modelbridge.rst

@@ -145,6 +145,13 @@ Dispatch Utilities
 
 Transforms
 ----------
+`ax.modelbridge.transforms.deprecated_transform_mixin`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. automodule:: ax.modelbridge.transforms.deprecated_transform_mixin
+    :members:
+    :undoc-members:
+    :show-inheritance:
 
 `ax.modelbridge.transforms.base`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~