update React Transition docs (#203)

Author: RobinMalfait

packages/@headlessui-react/README.md

@@ -144,31 +144,6 @@ function MyComponent() {
 }
 ```
 
-If you'd prefer not to render an additional element at all, you can pass your children as a function instead which will receive a `ref` that you need to attach to your root node:
-
-```tsx
-import { Transition } from '@headlessui/react'
-import { useState } from 'react'
-
-function MyComponent() {
-  const [isOpen, setIsOpen] = useState(false)
-
-  return (
-    <>
-      <button onClick={() => setIsOpen(!isOpen)}>Toggle</button>
-      <Transition
-        show={isOpen}
-        // ...
-      >
-        {ref => <div ref={ref}>{/* Your content goes here*/}</div>}
-      </Transition>
-    </>
-  )
-}
-```
-
-Be sure to attach the `ref` or your transitions will not work correctly.
-
 ### Animating transitions
 
 By default, a `Transition` will enter and leave instantly, which is probably not what you're looking for if you're using this library.
@@ -317,7 +292,7 @@ function MyComponent({ isShowing }) {
 | `show`        | Boolean                               | Whether the children should be shown or hidden.                                       |
 | `as`          | String Component _(Default: `'div'`)_ | The element or component to render in place of the `Transition` itself.               |
 | `appear`      | Boolean _(Default: `false`)_          | Whether the transition should run on initial mount.                                   |
-| `unmount`     | Boolean _(Default: `true`)_           | Whether the element should be unmounted or hidden based on the show state.            |
+| `unmount`     | Boolean _(Default: `true`)_           | Whether the element should be `unmounted` or `hidden` based on the show state.        |
 | `enter`       | String _(Default: '')_                | Classes to add to the transitioning element during the entire enter phase.            |
 | `enterFrom`   | String _(Default: '')_                | Classes to add to the transitioning element before the enter phase starts.            |
 | `enterTo`     | String _(Default: '')_                | Classes to add to the transitioning element immediately after the enter phase starts. |
@@ -331,9 +306,7 @@ function MyComponent({ isShowing }) {
 
 ##### Render prop arguments
 
-| Prop  | Type                   | Description                                                                         |
-| ----- | ---------------------- | ----------------------------------------------------------------------------------- |
-| `ref` | React.MutableRefObject | A ref that needs to be manually added to the child node when using the render prop. |
+- None
 
 #### Transition.Child
 
@@ -359,7 +332,7 @@ function MyComponent({ isShowing }) {
 | ----------- | ------------------------------------- | ------------------------------------------------------------------------------------- |
 | `as`        | String Component _(Default: `'div'`)_ | The element or component to render in place of the `Transition.Child` itself.         |
 | `appear`    | Boolean _(Default: `false`)_          | Whether the transition should run on initial mount.                                   |
-| `unmount`   | Boolean _(Default: `true`)_           | Whether the element should be unmounted or hidden based on the show state.            |
+| `unmount`   | Boolean _(Default: `true`)_           | Whether the element should be `unmounted` or `hidden` based on the show state.        |
 | `enter`     | String _(Default: '')_                | Classes to add to the transitioning element during the entire enter phase.            |
 | `enterFrom` | String _(Default: '')_                | Classes to add to the transitioning element before the enter phase starts.            |
 | `enterTo`   | String _(Default: '')_                | Classes to add to the transitioning element immediately after the enter phase starts. |
@@ -369,9 +342,7 @@ function MyComponent({ isShowing }) {
 
 ##### Render prop arguments
 
-| Prop  | Type                   | Description                                                                         |
-| ----- | ---------------------- | ----------------------------------------------------------------------------------- |
-| `ref` | React.MutableRefObject | A ref that needs to be manually added to the child node when using the render prop. |
+- None
 
 ---