* provider/aws: Update Lightsail supported regions
This commit complements (#14621)[https://github.com/hashicorp/terraform/pull/14621] and (#14685)[https://github.com/hashicorp/terraform/pull/14685].
* Revert "provider/aws: Update Lightsail supported regions"
This reverts commit 545c3d6e6e7a9b665542ecc3b5e4d857faac749b.
* This commit complements #14621 and #14685.
* Link to AWS docs instead of listing regions
Instead of explicitly listing supported Lightsail regions in the docs,
we now link to the Lightsail docs.