Fix #757 (#771)

* Fix #757

Fix #757

* Improved docs

Co-authored-by: Erik Rasmussen <[email protected]>

Author: Poyoman39

docs/types/FieldProps.md

@@ -164,6 +164,18 @@ Optional. Defaults to `===`.
 
 A function to determine if two values are equal.
 
+## `multiple`
+
+```ts
+boolean
+```
+
+Optional.
+
+Only of use when using `component="select"` and you want a multiselect.
+
+It will be added on your input component, or you may retrieve its value inside the "input" property of your custom components.
+
 ## `name`
 
 ```ts
@@ -237,6 +249,18 @@ Related:
 
 - [`FieldState`](/docs/final-form/types/FieldState)
 
+## `type`
+
+```ts
+string
+```
+
+Optional.
+
+If set to `"checkbox"` or `"radio"`, React Final Form will know to manage your values as a checkbox or radio button respectively. Results in a `checked` boolean inside the `input` value given to your render prop.
+
+It will be added on your input component, or you may retrieve its value inside the "input" property of your custom components
+
 ## `validate`
 
 ```ts