message: docs: Update v5.1.0 release notes
diff: # Community Solid Server release notes
  +## v5.1.0
  +
  +### New features
  +
  +- The `--config` CLI parameter now accepts multiple configuration paths, which will be combined.
  +- The `RedisLocker` now accepts more configuration parameters.
  +
  ## v5.0.0
  ### New features
  