[Docs] Don't show "PublicAPI" message for stable APIs (ray-project#39976)

Many of our APIs contain a disclaimer like:

> PublicAPI: This API is stable across Ray releases.

However, this disclaimer isn't useful because you'd assume an API is stable in the absence of any warning. To remove noise from our documentation, this PR removes the disclaimer.

---------

Signed-off-by: Balaji Veeramani <balaji@anyscale.com>
Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu>
Co-authored-by: angelinalg <122562471+angelinalg@users.noreply.github.com>

Author: bveeramani

python/ray/serve/config.py

@@ -28,6 +28,8 @@
 
 @PublicAPI(stability="stable")
 class AutoscalingConfig(BaseModel):
+    """Config for the Serve Autoscaler."""
+
     # Please keep these options in sync with those in
     # `src/ray/protobuf/serve.proto`.
 

python/ray/util/annotations.py

@@ -52,10 +52,8 @@ def wrap(obj):
                 f"**PublicAPI ({stability}):** This API is in {stability} "
                 "and may change before becoming stable."
             )
-        else:
-            message = "PublicAPI: This API is stable across Ray releases."
+            _append_doc(obj, message=message)
 
-        _append_doc(obj, message=message)
         _mark_annotated(obj)
         return obj