docs: Missing import in Firebase JavaScript SDK example

[Matthew Balshaw]

Plugin(s)

• Analytics
• App
• App Check
• Authentication
• Crashlytics
• Cloud Firestore
• Cloud Messaging
• Cloud Storage
• Performance
• Remote Config

Version

5.4.0

Platform(s)

• Android
• iOS
• Web

Current behavior

The import has the google auth provider but misses facebook and twitter, but though they are used later in the example

Expected behavior

If we include the import statement, it should be consistent and import all the required items

Reproduction

https://github.com/capawesome-team/capacitor-firebase/blob/main/packages/authentication/docs/firebase-js-sdk.md

Steps to reproduce

Its a docs issue

Other information

No response

Capacitor doctor

just a docs issue

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