Update docs

Author: rvsia

packages/react-renderer-demo/src/app/pages/renderer/field-provider.md

@@ -119,6 +119,10 @@ and informations about the formState.
 }
 ```
 
+# FormSpy provider
+
+Every component also receives component `FormSpyProvider` as a prop. You can find more info <a href="https://final-form.org/docs/react-final-form/api/FormSpy" rel="noopener noreferrer" target="_blank">here!</a>
+
 </Grid>
 <Grid item xs={false} md={2}>
   <ListOfContents file="renderer/field-provider" />

packages/react-renderer-demo/src/app/src/doc-components/pf4-wizard.md

@@ -16,6 +16,7 @@ Don't forget hide form controls by setting \`showFormControls\` to \`false\` as
 | isDynamic  | bool  | undefined  | will dynamically generate steps navigation (=progressive wizard), please use if you use any condition fields which changes any field in other steps (wizards with conditional steps are dynamic by default) |
 |showTitles|bool|undefined|If true, step titles will be shown in the wizard body|
 |predictSteps|bool|undefined|If true, dynamic wizard will predict steps in the navigation.|
+|crossroads|array|undefined|Array of field names, which change next steps|
 
 **Default buttonLabels**
 
@@ -37,6 +38,12 @@ You can rewrite only selection of them, e.g.
 
 (Others will stay default)
 
+**Crossroads**
+
+With the help of `crossroads` you can manually defined which fields change next steps and together with `predictSteps`, it will cause that the wizard navigation is always refreshed, when one of the crossroads name is changed.
+
+Ex.: `crossroads: ['name', 'nested.password']`
+
 **Docs for steps**
 
 | Props  | Type  |  Description |
@@ -174,6 +181,7 @@ Progressive wizard
 - use `isDynamic` prop to enforce it
 - use `predictSteps` to allow navigation to show future steps
     - if you have any conditional fields in the step, you should use `disableForwardJumping` in the step definition, to disable jumping forward in the navigation, otherwise user could miss the changed fields in next steps.
+- you can use `crossroads` to define, which fields the wizzard will listen to and change the navigation according to changes of the defined values 
 
 ![progressivewizard](https://user-images.githubusercontent.com/32869456/58427241-5b370a80-809f-11e9-8e79-a4a829b8d181.gif)