improve the auto-indenter
improve the auto-indenter

Change-Id: I5181d08a7641fad42f4c65bf1375d84ce442776f
Reviewed-on: https://gapi-review.git.corp.google.com/6570
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>

googleapis/gapic-generator-go,googleapis/gapic-generator-go