From 5ce1050a99b1e371dcf0d3f9d3d24ed5bf233cf8 Mon Sep 17 00:00:00 2001
From: Chase <chase@sillevis.net>
Date: Tue, 18 Aug 2020 19:13:19 +0200
Subject: [PATCH] Bigtable: Refer to a functional role for bigtable (doc
 update) (#6923)

Using `roles/editor` returns the following error:
```
Error: Error setting IAM policy for Bigtable Instance XXX/XXXbigtable-instance: googleapi: Error 400: Role (roles/editor) does not exist in the resource's hierarchy., badRequest
```