bundler: type must be of type itemExample
bundler: type must be of type itemExample

Add commentary about item type
https://github.com/googleapis/google-api-go-client/issues/422

Fixes #422

Change-Id: I344e5bdff7918c5bc3a4d35615a9426bece8c1b2
Reviewed-on: https://code-review.googlesource.com/c/google-api-go-client/+/53390
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Cody Oss <f11fa1e55ff5638510f5bf86ea76672a630250f9@google.com>

google/google-api-go-client,google/google-api-go-client,googleapis/google-api-go-client,googleapis/google-api-go-client