message: docs: remove duplicated isSubmitting option
diff: @@ -115,7 +115,6 @@ The default slot gives you access to the following props:
  | meta | `Record<string, boolean>` | An aggregate of the [FieldMeta](./api/field#fieldmeta) for the fields within the form |
  | values | `Record<string, any>` | The current field values |
  | isSubmitting | `boolean` | True while the submission handler for the form is being executed |
  -| isSubmitting | `boolean` | True while the submission handler for the form is being executed |
  | validate | `Function` | Validates the form |
  | handleSubmit | `(cb: Function) => Function` | Creates a submission handler that disables the native form submissions and executes the callback if the validation passes |
  | handleReset | `Function` | Resets and form and executes any `onReset` listeners on the component |
  