Docs: Fix broken external links in admin docs

doc/administration/packages/container_registry.md

@@ -475,7 +475,7 @@ To configure the `s3` storage driver in Omnibus:
      `bucket_name.host/object`. [Set to false for AWS S3](https://aws.amazon.com/blogs/aws/amazon-s3-path-deprecation-plan-the-rest-of-the-story/).
 
    You can set a rate limit on connections to S3 to avoid 503 errors from the S3 API. To do this,
-   set `maxrequestspersecond` to a number within the [S3 request rate threshold](https://aws.amazon.com/premiumsupport/knowledge-center/s3-503-within-request-rate-prefix/):
+   set `maxrequestspersecond` to a number within the [S3 request rate threshold](https://repost.aws/knowledge-center/s3-503-within-request-rate-prefix):
 
    ```ruby
       registry['storage'] = {
@@ -552,7 +552,7 @@ you can pull from the Container Registry, but you cannot push.
 
    NOTE:
    If you have a lot of data, you may be able to improve performance by
-   [running parallel sync operations](https://aws.amazon.com/premiumsupport/knowledge-center/s3-improve-transfer-sync-command/).
+   [running parallel sync operations](https://repost.aws/knowledge-center/s3-improve-transfer-sync-command).
 
 1. To perform the final data sync,
    [put the Container Registry in `read-only` mode](#performing-garbage-collection-without-downtime) and

doc/administration/reference_architectures/index.md

@@ -16,7 +16,7 @@ Depending on your workflow, the following recommended reference architectures
 may need to be adapted accordingly. Your workload is influenced by factors
 including how active your users are, how much automation you use, mirroring,
 and repository/change size. Additionally, the displayed memory values are
-provided by [GCP machine types](https://cloud.google.com/compute/docs/machine-types).
+provided by [GCP machine types](https://cloud.google.com/compute/docs/machine-resource).
 For different cloud vendors, attempt to select options that best match the
 provided architecture.