Update XMLRPC error message, to reference status.python.org (#8938)

* Update views.py

* Update test_xmlrpc.py

* Update test_xmlrpc.py

* Update views.py

Author: pradyunsg

tests/unit/legacy/api/xmlrpc/test_xmlrpc.py

@@ -124,9 +124,9 @@ def test_error_when_disabled(self, pyramid_request, metrics, monkeypatch):
             xmlrpc.search(pyramid_request, {"name": "foo", "summary": ["one", "two"]})
 
         assert exc.value.faultString == (
-            "RuntimeError: This API has been temporarily disabled due to unmanageable "
-            "load and will be deprecated in the near future. Please use the Simple or "
-            "JSON API instead."
+            "RuntimeError: PyPI's XMLRPC API has been temporarily disabled due to "
+            "unmanageable load and will be deprecated in the near future. See "
+            "https://status.python.org/ for more information."
         )
         assert metrics.increment.calls == [
             pretend.call("warehouse.xmlrpc.search.deprecated")

warehouse/legacy/api/xmlrpc/views.py

@@ -238,9 +238,10 @@ def search(request, spec: Mapping[str, Union[str, List[str]]], operator: str = "
         raise XMLRPCWrappedError(
             RuntimeError(
                 (
-                    "This API has been temporarily disabled due to unmanageable load "
-                    "and will be deprecated in the near future. Please use the Simple "
-                    "or JSON API instead."
+                    "PyPI's XMLRPC API has been temporarily disabled due to "
+                    "unmanageable load and will be deprecated in the near "
+                    "future. See https://status.python.org/ for more "
+                    "information."
                 )
             )
         )