Fix T6777

Closes https://vyos.dev/T6777

Related to sphinx-doc/sphinx#13019 and https://github.com/orgs/sphinx-doc/discussions/13020

Author: marek22k

docs/_ext/vyos.py

@@ -221,7 +221,7 @@ def run(self):
             path = os.path.join(self.standard_include_path, path[1:-1])
         path = os.path.normpath(os.path.join(source_dir, path))
         path = utils.relative_path(None, path)
-        path = nodes.reprunicode(path)
+        path = str(path)
         encoding = self.options.get(
             'encoding', self.state.document.settings.input_encoding)
         e_handler=self.state.document.settings.input_encoding_error_handler