add 'paragraph' node to docutils

Author: danieleades

stubs/docutils/docutils/nodes.pyi

@@ -104,6 +104,9 @@ class Element(Node):
     def astext(self) -> str: ...
     def __getattr__(self, __name: str) -> Incomplete: ...
 
+class TextElement(Element):
+    child_text_separator: str = ""
+
 class Text(Node, str):
     tagname: ClassVar[str]
     children: tuple[()]
@@ -132,6 +135,8 @@ class document(Root, Structural, Element):
     def astext(self) -> str: ...
     def __getattr__(self, __name: str) -> Incomplete: ...
 
+class paragraph(General, TextElement): ...
+
 class NodeVisitor:
     def __init__(self, document: document): ...
     def __getattr__(self, __name: str) -> Incomplete: ...