docs: Refine docs for multi-cam a bit

Author: mrousavy

docs/content/docs/multi-camera.mdx

@@ -19,12 +19,9 @@ if (VisionCamera.supportsMultiCamSessions) {
 
 ### Getting Multi-Cam capable CameraDevices
 
-Due to hardware constraints, not every [`CameraDevice`](/api/react-native-vision-camera/hybrid-objects/CameraDevice) can be paired with every other [`CameraDevice`](/api/react-native-vision-camera/hybrid-objects/CameraDevice) - therefore VisionCamera exposes a fixed array of supported combinations via [`CameraDeviceFactory.supportedMultiCamDeviceCombinations`](/api/react-native-vision-camera/hybrid-objects/CameraDeviceFactory#supportedmulticamdevicecombinations) upfront:
+Due to hardware constraints, not every [`CameraDevice`](/api/react-native-vision-camera/hybrid-objects/CameraDevice) can be paired with every other [`CameraDevice`](/api/react-native-vision-camera/hybrid-objects/CameraDevice), therefore VisionCamera exposes a list of supported device combinations via [`supportedMultiCamDeviceCombinations`](/api/react-native-vision-camera/hybrid-objects/CameraDeviceFactory#supportedmulticamdevicecombinations) upfront:
 
 ```ts
-if (!VisionCamera.supportsMultiCamSessions)
-  return
-
 const deviceFactory = await VisionCamera.createDeviceFactory()
 const frontAndBackCombination =
   deviceFactory.supportedMultiCamDeviceCombinations.find((devices) => {
@@ -42,10 +39,9 @@ const backDevice = frontAndBackCombination.find((d) => d.position === 'back')
 
 ### Using multiple Connections
 
-Then, knowing `frontDevice` and `backDevice` can be used simultaneously in a Multi-Cam session, create the [`CameraSession`](/api/react-native-vision-camera/hybrid-objects/CameraSession), and attach the [`CameraSessionConnection`](/api/react-native-vision-camera/interfaces/CameraSessionConnection)s:
+Then, knowing `frontDevice` and `backDevice` can be used simultaneously in a Multi-Cam session, create the outputs and build the [`CameraSessionConnection`](/api/react-native-vision-camera/interfaces/CameraSessionConnection)s:
 
 ```ts
-const session = await VisionCamera.createCameraSession(true)
 const frontPreviewOutput = VisionCamera.createPreviewOutput()
 const frontPhotoOutput = VisionCamera.createPhotoOutput({})
 const backPreviewOutput = VisionCamera.createPreviewOutput()

packages/react-native-vision-camera/src/specs/inputs/CameraDeviceFactory.nitro.ts

@@ -39,7 +39,7 @@ export interface CameraDeviceFactory
    * and a {@linkcode CameraPosition | 'back'} {@linkcode CameraDevice} are
    * supported to be used in a Multi-Cam {@linkcode CameraSession} - in this case,
    * the returned 2D Array looks something like this:
-   * ```
+   * ```json
    * [
    *   [{ position: 'back', ... }, { position: 'front', ... }]
    * ]