Fix steps for creating a new app to avoid incompatible versions of react-native and react-native-windows being used (#1009)

## Description
Fix steps for creating a new app to avoid incompatible versions of
`react-native` and `react-native-windows` being used

### Why
Prevents bad experience for new users of RNW.

An issue was hit where using the latest version of `react-native` (0.78)
to create an app would lead to it being incompatible with the latest
version of `react-native-windows`. These steps make sure that the user
is using a compatible version of `react-native` for their desired
version of `react-native-windows`.

## Screenshots
Add any relevant screen captures here from before or after your changes.

###### Microsoft Reviewers: [Open in
CodeFlow](https://microsoft.github.io/open-pr/?codeflow=https://github.com/microsoft/react-native-windows-samples/pull/1009)

Author: Yajur-Grover

website/versioned_docs/version-0.77/getting-started.md

@@ -26,7 +26,7 @@ Remember to call `@react-native-community/cli init` from the place you want your
 <!-- See https://www.npmjs.com/package/react-native?activeTab=versions for the RN version tags. -->
 
 ```bat
-npx --yes @react-native-community/cli@next init <projectName> --version "latest"
+npx --yes @react-native-community/cli@next init <projectName> --version "^0.77.0"
 ```
 
 ### Navigate into this newly created directory