Address PR comments

Signed-off-by: Clare Liguori <liguori@amazon.com>

.changeset/slow-flies-marry.md

@@ -4,3 +4,6 @@
 ---
 
 Upgrade to AWS SDK for Javascript v3
+
+Techdocs support for AWS S3 now requires defining the AWS region to connect to
+If `techdocs.publisher.awsS3.region` is missing from the config, the AWS environment variable `AWS_REGION` will be used.

plugins/techdocs-node/src/stages/publish/awsS3.test.ts

@@ -464,8 +464,8 @@ describe('AwsS3Publish', () => {
       const fails = publisher.fetchTechDocsMetadata(invalidEntityName);
 
       await expect(fails).rejects.toMatchObject({
-        message: expect.stringMatching(
-          'TechDocs metadata fetch failed; caused by Error: The file invalid/triplet/path/techdocs_metadata.json does not exist',
+        message: expect.stringContaining(
+          'The file invalid/triplet/path/techdocs_metadata.json does not exist',
         ),
       });
     });