message: fix: Adding corrected code documentation for custom field extension
diff: @@ -27,19 +27,20 @@ You can create your own Field Extension by using the
  ```tsx
  //packages/app/scaffolder/MyCustomExtension/MyCustomExtension.tsx
  +import React from 'react';
  import { FieldProps, FieldValidation } from '@rjsf/core';
  +import FormControl from '@material-ui/core/FormControl';
  import { KubernetesValidatorFunctions } from '@backstage/catalog-model';
  /*
  This is the actual component that will get rendered in the form
  */
  -export const MyCustomExtension = ({ onChange, required }: FieldProps<string>) => {
  +export const MyCustomExtension = ({ onChange, rawErrors, required, formData }: FieldProps<string>) => {
  return (
  <FormControl
  margin="normal"
  required={required}
  error={rawErrors?.length > 0 && !formData}
  - onChange={onChange}
  - >
  + onChange={onChange} />
  )
  };
  