Migrate node.js client object naming guidance to this guide

### Description

The following text is from another node.js guide. Let's consolidate this to one place:

```
Name the variable the camel-cased version of the constructor, making sure the variable name ends with `Client`.

As variable names, `someApi` and `client` are each not descriptive enough. `someApiClient` follows a standard pattern that balances being descriptive and allowing for multiple clients in a single sample.
```

### Impact

_No response_

### Challenge

_No response_