old_contents: # Database configuration string
  DATABASE_CONFIGURATION = 'sqlite:///:memory:'
  
  # If True, use memcached for storing registration and authentication requests
  # in progress, instead of persisting them to the database.
  USE_MEMCACHED = False
  
  # If memcached is enabled, use thes servers.
  MEMCACHED_SERVERS = ['127.0.0.1:11211']
  
  # Add files containing trusted metadata JSON to the directory below.
  METADATA = '/etc/yubico/u2fval/metadata/'
  
  # Allow the use of untrusted (for which attestation cannot be verified using
  # the available trusted metadata) U2F devices.
  ALLOW_UNTRUSTED = False
  
new_contents: # Database configuration string
  DATABASE_CONFIGURATION = 'sqlite:///:memory:'
  
  # If True, use memcached for storing registration and authentication requests
  # in progress, instead of persisting them to the database.
  USE_MEMCACHED = False
  
  # If memcached is enabled, use these servers.
  MEMCACHED_SERVERS = ['127.0.0.1:11211']
  
  # Add files containing trusted metadata JSON to the directory below.
  METADATA = '/etc/yubico/u2fval/metadata/'
  
  # Allow the use of untrusted (for which attestation cannot be verified using
  # the available trusted metadata) U2F devices.
  ALLOW_UNTRUSTED = False
  
subject: Fix typo.