docs: Update README.adoc for v5.6.0, v4.10.8 and v3.8.8

[mpeddada1]

We'd love to accept your patches and contributions to this project. There are just a few small
guidelines you need to follow before opening an issue or a PR:

1. Ensure the issue was not already reported.
2. Open a new issue if you are unable to find an existing issue addressing your problem. Make sure
   to include a title and clear description, as much relevant information as possible, and a code
   sample or an executable test case demonstrating the expected behavior that is not occurring.
3. Discuss the priority and potential solutions with the maintainers in the issue. The maintainers
   would review the issue and add a label "Accepting Contributions" once the issue is ready for
   accepting contributions.
4. Open a PR only if the issue is labeled with "Accepting Contributions", ensure the PR description
   clearly describes the problem and solution. Note that an open PR without an issue labeled with "
   Accepting Contributions" will not be accepted.

See
also CONTRIBUTING.md
.