Based on my knowledge of the astropy codebase and the issue description, I can create the patch. The issue is that the RST (RestructuredText) writer doesn't support the `header_rows` parameter that's available in the `FixedWidth` format.

Looking at the error trace and the astropy ASCII I/O module structure:
- The RST class is in `astropy/io/ascii/rst.py`
- The FixedWidth class with `header_rows` support is in `astropy/io/ascii/fixedwidth.py`
- RST inherits from FixedWidth but doesn't pass through the `header_rows` parameter

The RST format extends FixedWidth format with different delimiters (using `=` for borders). To support `header_rows`, the RST class needs to:
1. Accept the `header_rows` parameter in its `__init__` method
2. Pass it to the parent FixedWidth class

Here's the patch:

--- a/astropy/io/ascii/rst.py
+++ b/astropy/io/ascii/rst.py
@@ -27,6 +27,11 @@ class RST(FixedWidth):
     Example::
 
         ==== ===== ======
+        Col1  Col2  Col3
+        ==== ===== ======
+
+    Or with ``header_rows`` attribute, one can specify a header consisting
+    of multiple rows. Example::
         Col1  Col2  Col3
           nm     m    kg
         ==== ===== ======
@@ -38,9 +43,12 @@ class RST(FixedWidth):
 
     data_class = SimpleRSTData
     header_class = SimpleRSTHeader
+    header_rows = ['name', 'unit']
 
-    def __init__(self):
-        super().__init__(delimiter_pad=None, bookend=False)
+    def __init__(self, header_rows=None):
+        super().__init__(delimiter_pad=None, bookend=False,
+                         header_rows=header_rows if header_rows is not None
+                         else ['name'])
 
     def write(self, lines):
         lines = super().write(lines)