Update DOKS documentation to call out token expiration

[scottslowe]

Hello!

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Issue details

Per #312 and #78, DO access tokens generated by pulumi up expire after 7 days. This comment on #312 provides a workaround and some additional context, but ideally this information about access token expiration should be included in the documentation so that users are aware and can plan/act accordingly.

Affected area/feature

Provider/resource documentation for DOKS

[t0yv0]

Thanks for filing this @scottslowe - I've tried doing this immediately but there's some hiccups in the bridge framework that do not permit easily adding a comment. I've filed pulumi/pulumi-terraform-bridge#1237 and my team will get back to this when we have capacity.