4.0.0_release_blocker granted: [Bug 122300] Update the README file

[bugzilla]

j...@apache.org has granted Ariel Constenla-Haile <arie...@apache.org>'s request
for 4.0.0_release_blocker:
Bug 122300: Update the README file
https://issues.apache.org/ooo/show_bug.cgi?id=122300