multiple updates after PR review:

- pom.xml reformatted
- root README missing Amazon S3 link
- atLeastOnce abandoned in favor of times(x)
- minor corrections

Signed-off-by: Andrea Cioni <[email protected]>

Author: andreacioni

README.md

@@ -102,6 +102,7 @@ noted differently for individual extension Modules, but this should be the rare
 
 **We look forward to your contributions!!**
 
+[Amazon S3]: https://aws.amazon.com/s3/
 [Apache Geode]: https://geode.apache.org
 [Apache License]: https://www.apache.org/licenses/LICENSE-2.0
 [Contributor Guidelines]: CONTRIBUTING.md