message: Remove wrong infomation from the migration guide
  migrate-to-6: remove notice that "buildSchema" (and all functions using it) had "options" removed
diff: @@ -31,10 +31,6 @@ Note: Typegoose Class has still all the functions, but they are marked deprecate
  ## ModelOptions
  -- `getModelForClass(class, options)`' options got removed
  -- `setModelForClass(class, options)`' options got removed
  -- `buildSchema(class, options)`' options got removed
  -
  use the following decorator now
  ```ts
  @@ -42,6 +38,8 @@ use the following decorator now
  class Name {}
  ```
  +otherwise the functions still override the settings made in `modelOptions`
  +
  ## Hooks
  Hooks got (in 6.0.0-13) a change for the types to comply with the latest mongoose (5.6.8)
  