Remove some documentation referencing the source

Remove some documentation referencing the source

These break in sbuild with:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/sphinx/cmd/build.py", line 281, in build_main
    app.build(args.force_all, args.filenames)
  File "/usr/lib/python3/dist-packages/sphinx/application.py", line 341, in build
    self.builder.build_update()
  File "/usr/lib/python3/dist-packages/sphinx/builders/__init__.py", line 310, in build_update
    self.build(to_build,
  File "/usr/lib/python3/dist-packages/sphinx/builders/__init__.py", line 376, in build
    self.write(docnames, list(updated_docnames), method)
  File "/usr/lib/python3/dist-packages/sphinx/builders/__init__.py", line 571, in write
    self._write_serial(sorted(docnames))
  File "/usr/lib/python3/dist-packages/sphinx/builders/__init__.py", line 574, in _write_serial
    with logging.pending_warnings():
  File "/usr/lib/python3.10/contextlib.py", line 142, in __exit__
    next(self.gen)
  File "/usr/lib/python3/dist-packages/sphinx/util/logging.py", line 218, in pending_warnings
    memhandler.flushTo(logger)
  File "/usr/lib/python3/dist-packages/sphinx/util/logging.py", line 183, in flushTo
    logger.handle(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 1634, in handle
    self.callHandlers(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 1696, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 964, in handle
    rv = self.filter(record)
  File "/usr/lib/python3.10/logging/__init__.py", line 821, in filter
    result = f.filter(record)
  File "/usr/lib/python3/dist-packages/sphinx/util/logging.py", line 499, in filter
    record.location = get_node_location(location)
  File "/usr/lib/python3/dist-packages/sphinx/util/logging.py", line 519, in get_node_location
    source = abspath(source)
  File "/usr/lib/python3/dist-packages/sphinx/util/osutil.py", line 136, in abspath
    pathdir = path.abspath(pathdir)
  File "/usr/lib/python3.10/posixpath.py", line 378, in abspath
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not StringList

Gbp-Pq: Name 0009-Remove-some-documentation-referencing-the-source.patch