Update output text as per review

src/_pytest/warnings.py

@@ -92,9 +92,7 @@ def warning_record_to_str(warning_message: warnings.WarningMessage) -> str:
                 formatted_tb = "\n".join(tb.format())
                 # Use a leading new line to better separate the (large) output
                 # from the traceback to the previous warning text.
-                msg += (
-                    f"\nObject allocated at (most recent call first):\n{formatted_tb}"
-                )
+                msg += f"\nObject allocated at:\n{formatted_tb}"
             else:
                 # No need for a leading new line.
                 url = "https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings"

testing/test_warnings.py

@@ -819,7 +819,7 @@ def test_resource_warning(pytester: Pytester, monkeypatch: pytest.MonkeyPatch) -
     expected_extra = (
         [
             "*ResourceWarning* unclosed file*",
-            "*Object allocated at (most recent call first)*",
+            "*Object allocated at*",
         ]
         if has_tracemalloc
         else []