[pydocstyle] Handle arguments with the same names as sections (D417) (#16011)

## Summary

Fixes #16007. The logic from the last fix for this (#9427) was
sufficient, it just wasn't being applied because `Attributes` sections
aren't expected to have nested sections. I just deleted the outer
conditional, which should hopefully fix this for all section types.

## Test Plan

New regression test, plus the existing D417 tests.

crates/ruff_linter/resources/test/fixtures/pydocstyle/D417.py

@@ -176,4 +176,45 @@ def f(x, *args, **kwargs):
         x: the value
         *args: var-arguments
     """
-    return x
+    return x
+
+
+# regression test for https://github.com/astral-sh/ruff/issues/16007.
+# attributes is a section name without subsections, so it was failing the
+# previous workaround for Args: args: sections
+def send(payload: str, attributes: dict[str, Any]) -> None:
+    """
+    Send a message.
+
+    Args:
+        payload:
+            The message payload.
+
+        attributes:
+            Additional attributes to be sent alongside the message.
+    """
+
+
+# undocumented argument with the same name as a section
+def should_fail(payload, Args):
+    """
+    Send a message.
+
+    Args:
+        payload:
+            The message payload.
+    """
+
+
+# documented argument with the same name as a section
+def should_not_fail(payload, Args):
+    """
+    Send a message.
+
+    Args:
+        payload:
+            The message payload.
+
+        Args:
+            The other arguments.
+    """