docs: Fix missing verb in Footer component documentation (#9393)

dev-docs/docs/@excalidraw/excalidraw/api/children-components/footer.mdx

@@ -2,7 +2,7 @@
 
 Earlier we were using `renderFooter` prop to render custom footer which was removed in [#5970](https://github.com/excalidraw/excalidraw/pull/5970). Now you can pass a `Footer` component instead to render the custom UI for footer.
 
-You will need to import the `Footer` component from the package and wrap your component with the Footer component. The `Footer` should a valid React Node.
+You will need to import the `Footer` component from the package and wrap your component with the Footer component. The `Footer` should be a valid React Node.
 
 **Usage**
 
@@ -25,7 +25,7 @@ function App() {
 }
 ```
 
-This will only for `Desktop` devices.
+This will only work for `Desktop` devices.
 
 For `mobile` you will need to render it inside the [MainMenu](#mainmenu). You can use the [`useDevice`](#useDevice) hook to check the type of device, this will be available only inside the `children` of `Excalidraw` component.
 
@@ -65,4 +65,4 @@ const App = () => (
 // Need to render when code is span across multiple components
 // in Live Code blocks editor
 render(<App />);
-```
+```