docs(logs-destinations): correctly set package description in README

[mrgrain]

The README uses a "for AWS XXX" description as the main header. This updates that header
to match the format used for the Kinesis Destinations and Lambda Destinations libraries.

This is a backport of #21570 to v1

---

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• Have you followed the guidelines in our Contributing guide?

Adding new Unconventional Dependencies:

• This PR adds new unconventional dependencies following the process described here

New Features

• Have you added the new feature to an integration test?
  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[aws-cdk-automation]

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• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 88b1a7d
• Result: SUCCEEDED
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