docs(cloud_firestore): Fix method name typo in code documentation

[dutsky]

Description

There is method name typo in cloud_firestore query documentation. This PR fix it.

Related Issues

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[russellwheatley]

Hey @dutsky, thanks for the PR! Do you mind updating these two instances as well? We should be able to get it merged in after that 🙏

https://github.com/FirebaseExtended/flutterfire/blob/1f8d79a3ee2ab6e5a73cd57d1ce164bccfe14879/packages/cloud_firestore/cloud_firestore_platform_interface/lib/src/platform_interface/platform_interface_query.dart#L150

https://github.com/FirebaseExtended/flutterfire/blob/1f8d79a3ee2ab6e5a73cd57d1ce164bccfe14879/packages/cloud_firestore/cloud_firestore_platform_interface/lib/src/platform_interface/platform_interface_query.dart#L168

[dutsky]

Hey @russellwheatley. Done, thanks!

[russellwheatley]

LGTM