FCE-783/changing device docs (#85)

## Description

Add a paragraph about changing cameras and microphones.

Author: czerwiukk

docs/glossary.md

@@ -4,7 +4,7 @@ sidebar_position: 8
 
 # Glossary
 
-Terms used in our documentation
+A brief walk-through of the terms we use in the documentation.
 
 ### Room
 

docs/react/toggling-devices.mdx docs/react/managing-devices.mdxdocs/react/toggling-devices.mdx renamed to docs/react/managing-devices.mdx

@@ -2,9 +2,34 @@
 sidebar_position: 4
 ---
 
-# Toggling devices
+# Managing devices
 
-The Fishjam SDK provides functions for dynamically controlling media device streams. This includes turning the cameras and microphones on and off, as well as muting and unmuting microphones.
+The Fishjam SDK provides functions for dynamically controlling media device streams. This includes selecting desired cameras and microphones, turning them on and off, as well as muting and unmuting microphones.
+
+### Selecting Camera and Microphone - [`selectCamera()`](/api/web/type-aliases/UseCameraResult#selectcamera) and [`selectMicrophone()`](/api/web/type-aliases/UseMicrophoneResult#selectmicrophone)
+
+To select the desired camera or microphone, use the [`selectCamera()`](/api/web/type-aliases/UseCameraResult#selectcamera) and [`selectMicrophone()`](/api/web/type-aliases/UseMicrophoneResult#listmicrophones) functions.  
+Lists of the available devices are available via the [`cameraDevices`](/api/web/type-aliases/UseCameraResult#cameradevices) and [`microphoneDevices`](/api/web/type-aliases/UseMicrophoneResult#microphonedevices) properties.
+
+#### Usage Example
+
+```tsx
+import { useCamera } from "@fishjam-cloud/react-client";
+
+export function CameraControl() {
+  const { cameraDevices, selectCamera } = useCamera();
+
+  return (
+    <ul>
+      {cameraDevices.map(({ deviceId, label }) => (
+        <li key={deviceId}>
+          <button onClick={() => selectCamera(deviceId)}>{label}</button>
+        </li>
+      ))}
+    </ul>
+  );
+}
+```
 
 ### Turning Camera On and Off - [`toggleCamera()`](/api/web/type-aliases/UseCameraResult#togglecamera)