removeDocument abstract method
Removes a document from the cloud storage at the given path with the
given documentId.
The path is a string that represents the path to the document
excluding the document id. The path must always resolve to a collection.
If the path is empty, then the document is added to "default"
collection. If the path ends in a document path, then "default" is
suffixed to the path to make it a collection path.
Path can be separated by '/' or '.'.
documentId is the id of the document. If documentId is empty, then
"default" is used as the document id.
If the document does not exist, then it will return false. Otherwise it will return true.
Implementation
Future<bool> removeDocument(String path, String documentId);