The VMware NSX for vSphere release notes are available in the VMware docs page:

1. Go to your web browser and navigate to the VMware NSX for vSphere docs page (https://docs.vmware.com/en/VMware-NSX-for-vSphere/index.html).
2. To read and review the NSX for vSphere release notes, expand the Release Notes link and click the desired version of NSX for vSphere release notes.
3. To read and review the upgrade documents, click the NSX Upgrade Guide link, expand the PDFs link, and click the NSX Upgrade Guide link under the PDFs section.