refactor(markdown): create a class for the markdown backend options

Signed-off-by: Cesar Berrospi Ramis <ceb@zurich.ibm.com>

Author: ceberam

docling/backend/md_backend.py

@@ -30,7 +30,7 @@
     DeclarativeDocumentBackend,
 )
 from docling.backend.html_backend import HTMLDocumentBackend
-from docling.datamodel.backend_options import HTMLBackendOptions
+from docling.datamodel.backend_options import HTMLBackendOptions, MarkdownBackendOptions
 from docling.datamodel.base_models import InputFormat
 from docling.datamodel.document import InputDocument
 
@@ -96,7 +96,7 @@ def __init__(
         self,
         in_doc: InputDocument,
         path_or_stream: Union[BytesIO, Path],
-        options: HTMLBackendOptions = HTMLBackendOptions(),
+        options: MarkdownBackendOptions = MarkdownBackendOptions(),
     ):
         super().__init__(in_doc, path_or_stream, options)
 

docling/datamodel/backend_options.py

@@ -44,6 +44,10 @@ class HTMLBackendOptions(BaseBackendOptions):
     )
 
 
+class MarkdownBackendOptions(HTMLBackendOptions):
+    """Options specific to the Markdown backend."""
+
+
 BackendOptions = Annotated[
     Union[DeclarativeBackendOptions, HTMLBackendOptions], Field(discriminator="kind")
 ]