perhaps just have the env var names, with a link to the script, rather than have the script inlined (a bit of overhead to reading)? i see value in both, so idk

Is this script helpful? I cannot tell given you have said `helpX` only 3 times

WDYT about this? ```suggestion eksctl now requires supplying an `overrideBootstrapCommand` for unmanaged nodegroups when using a custom AMI. <a class="md-button md-button--primary" href="/usage/nodegroup-override-announcement">Read more</a> ```

```suggestion API_SERVER_URL="${API_SERVER_URL}" ```

Minor nit: ```suggestion Expect(api.ValidateNodeGroup(0, ng0)).To(MatchError(ContainSubstring("overrideBootstrapCommand is required when using a custom AMI "))) ```

These policies are attached by default and are unrelated to using a custom AMI. To keep this example focused, we should remove this and consider adding another example demonstrating the `iam.attachPolicyARNs` feature. ```suggestion ```

do we want to document what will be available from the helper script so they dont have to go read it?

```suggestion eksctl will no longer support unmanaged nodegroup custom AMIs with no bootstrap scripts. <a class="md-button md-button--primary" href="/usage/nodegroup-override-announcement">Read more</a> ```

do we have any example clusters in `examples/` that we should update (or remove and add a new example)?