message: docs: Add parseContentType changes
diff: @@ -19,7 +19,7 @@ The following changes are relevant for v3 custom configs that replaced certain f
  ### Interface changes
  These changes are relevant if you wrote custom modules for the server that depend on existing interfaces.
  -- ...
  +- The output of `parseContentType` in `HeaderUtil` was changed to include parameters.
  ## v3.0.0
  ### New features
  