message: docs(environment): add note about why "TG_ALLOW_MIXED" exists
diff: @@ -10,6 +10,7 @@ Typegoose allows the use of some environment variables to set global options.
  ### TG_ALLOW_MIXED
  Sets the options [`options.allowMixed`](./decorators/modelOptions.md#allowmixed) to the given Severity.
  +This option mainly exists to force it to run for just a run without modifying the actual code to see what is actually happening.
  Accepts:
  