docs(faraday-ui): fix markdown links

packages/component-faraday-ui/src/helpers/helpers.md

@@ -2,22 +2,22 @@
 
 _Utility HOCs_
 
-* [withCountries](#withCountries)
-* [withFetching](#withFetching)
-* [withFileDownload](#withFileDownload)
-* [withFilePreview](#withFilePreview)
-* [withPagination](#withPagination)
-* [withRoles](#withRoles)
-* [withZipDownload](#withZipDownload)
+* [withCountries](#withcountries)
+* [withFetching](#withfetching)
+* [withFileDownload](#withfiledownload)
+* [withFilePreview](#withfilepreview)
+* [withPagination](#withpagination)
+* [withRoles](#withroles)
+* [withZipDownload](#withzipdownload)
 
 _HOCs used for files drag and drop_
 
-* [withFileSectionDrop](#withFileSectionDrop)
-* [withNativeFileDrop](#withNativeFileDrop)
+* [withFileSectionDrop](#withfilesectiondrop)
+* [withNativeFileDrop](#withnativefiledrop)
 
 _Utility functions_
 
-* [handleError](#handleError)
+* [handleError](#handleerror)
 
 # Utility HOCs
 
@@ -97,7 +97,7 @@ const Wrapped = ({ downloadFile }) => (
   </div>
 )
 
-export default Wrapped
+export default withFileDownload(Wrapped)
 ```
 
 ## withFilePreview
@@ -112,6 +112,25 @@ This HOC assumes the following props are present on the wrapped component:
 
 * `previewFile: (file: {id: string, ...}) => any`: opens the file preview in a new tab (only possible for PDF files and images)
 
+```javascript
+import { withProps } from 'recompose'
+import { FileItem, withFilePreview Wrapped} from 'pubsweet-component-faraday-ui'
+
+const file = {
+  id: 'myfile',
+  name: 'myfile.pdf',
+  size: 100231,
+}
+
+const Wrapped = ({ previewFile }) => (
+  <div>
+    <FileItem item={file} onPreview={previewFile} />
+  </div>
+)
+
+export default withFilePreview(Wrapped)
+```
+
 ## withPagination
 
 Injects `page`, `itemsPerPage`, `toFirst`, `nextPage`, `toLast`, `prevPage`, `changeItemsPerPage`, `hasMore`, `maxItems` and `paginatedItems` as props.