Improve docstring formatting

src/pmhclib/pmhc.py

@@ -339,16 +339,18 @@ def wait_for_extract(self, uuid: str, max_retries: int) -> bool:
  return the same HTTP status (400) and JSON response when
  trying to fetch the extract by UUID:
 
- https://pmhc-mds.net/api/extract/{download_uuid}/fetch
-
- {
- "errors": {
- "export_fetch": "Can not fetch extract for uuid
- [123...]. Extract is not complete. Extract has
- expired."
- }
- }
- 
+ .. code-block:: text
+
+ https://pmhc-mds.net/api/extract/{download_uuid}/fetch
+
+ {
+ "errors": {
+ "export_fetch": "Can not fetch extract for uuid
+ [123...]. Extract is not complete. Extract has
+ expired."
+ }
+ }
+
  For this reason, it's not sufficient to simply try the
  download URL until we get a success code. If there is
  a PMHC server error, we will end up retrying forever.