Add space after ClassDoc (#317)

Add an extra line after the ClassDoc, as described by [PEP
257](https://peps.python.org/pep-0257/#multi-line-docstrings):

> Insert a blank line after all docstrings (one-line or multi-line) that
document a class – generally speaking, the class’s methods are separated
from each other by a single blank line, and the docstring needs to be
offset from the first method by a blank line.

Author: mauriciogardini

.chronus/changes/feature-add-spacing-to-class-doc-2025-9-8-21-20-1.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@alloy-js/python"
+---
+
+Add an extra line after the ClassDoc

packages/python/src/components/ClassDeclaration.tsx

@@ -62,7 +62,10 @@ export function ClassDeclaration(props: ClassDeclarationProps) {
       <MemberScope ownerSymbol={sym}>
         {basesPart}
         <PythonBlock opener=":">
-          <Show when={Boolean(props.doc)}>{props.doc}</Show>
+          <Show when={Boolean(props.doc)}>
+            {props.doc}
+            <line />
+          </Show>
           {hasChildren ? props.children : "pass"}
         </PythonBlock>
       </MemberScope>

packages/python/test/pydocs.test.tsx

@@ -1031,6 +1031,7 @@ describe("Full example", () => {
               Note:
                   Do not include the 'self' parameter in the Args section.
               """
+
               just_name = None
               name_and_type: int = None
               name_type_and_value: int = 12
@@ -1366,6 +1367,7 @@ describe("Full example", () => {
 
                 error_code (int): Numeric error code for the validation failure.
             """
+
             field_name: str = None
             error_code: int = None