Fix import order in update_settings_docs.py. NFC

This was broken due to the #25594 and #25596 racing.

Author: sbc100

tools/maint/update_settings_docs.py

@@ -25,8 +25,8 @@
 
 sys.path.insert(0, root_dir)
 
+from tools.settings import DEPRECATED_SETTINGS, LEGACY_SETTINGS
 from tools.utils import path_from_root, read_file, safe_ensure_dirs
-from tools.settings import LEGACY_SETTINGS, DEPRECATED_SETTINGS
 
 header = '''\
 .. _settings-reference: