task: update documentation for v26.1.2-rc.3

[nvidia-ci-cd]

Created by the docs-ci job in Mellanox/network-operator-docs.

[greptile-apps]

Greptile Summary

This PR refreshes the docs for the v26.1.2-rc.3 release. The main changes are:

• Shared documentation variables moved from rc.1 to rc.3.
• Helm customization defaults now show rc.3 image tags.
• Processed example manifests now use rc.3 component images and DOCA driver build -5.
• Image SHA256 tables were updated for the new Network Operator and DOCA driver images.

Confidence Score: 5/5

This looks safe to merge after checking the STIG digest table coverage.

• The version bump is consistent across shared variables, Helm docs, and processed examples.
• One documentation table may omit STIG-FIPS Ubuntu platforms that users need for digest pinning.
• No blocking runtime or build issue was found in the changed files.

docs/advanced/images-sha256.rst

Important Files Changed

Filename	Overview
docs/common/vars.rst	Updates common release substitutions from rc.1 to rc.3 and DOCA driver build -4 to -5.
docs/advanced/images-sha256.rst	Refreshes image tags and digests for rc.3 and DOCA driver build -5, with one possible STIG-FIPS platform coverage gap.
docs/customizations/helm.rst	Updates documented Helm image defaults to rc.3 tags.
examples/processed/host-device-rdma/10-nicclusterpolicy.yaml	Updates processed host-device RDMA component versions to rc.3.
examples/processed/host-device-rdma/complete.yaml	Mirrors the host-device RDMA rc.3 updates in the complete manifest.
examples/processed/ipoib-rdma-shared/10-nicclusterpolicy.yaml	Updates IPOIB RDMA shared component versions to rc.3 and DOCA driver build -5.
examples/processed/ipoib-rdma-shared/complete.yaml	Mirrors the IPOIB RDMA shared rc.3 and DOCA driver updates in the complete manifest.
examples/processed/macvlan-rdma-shared/10-nicclusterpolicy.yaml	Updates macvlan RDMA shared component versions to rc.3.
examples/processed/macvlan-rdma-shared/complete.yaml	Mirrors the macvlan RDMA shared rc.3 updates in the complete manifest.
examples/processed/sriov-ib-rdma/10-nicclusterpolicy.yaml	Updates SR-IOV IB RDMA component versions to rc.3 and DOCA driver build -5.
examples/processed/sriov-ib-rdma/complete.yaml	Mirrors the SR-IOV IB RDMA rc.3 and DOCA driver updates in the complete manifest.
examples/processed/sriov-network-rdma/10-nicclusterpolicy.yaml	Updates SR-IOV Network RDMA component versions to rc.3.
examples/processed/sriov-network-rdma/complete.yaml	Mirrors the SR-IOV Network RDMA rc.3 updates in the complete manifest.

_{Reviews (1): Last reviewed commit: "task: update documentation for v26.1.2-r..." | Re-trigger Greptile}

[greptile-apps]

STIG Ubuntu Platforms Disappear

The updated STIG-FIPS driver table now documents only ubuntu24.04-amd64, while the non-STIG driver table lists Ubuntu 22.04, Ubuntu 24.04, and arm64 variants for the same driver release. When a user follows the government-ready install path on Ubuntu 22.04 or arm64 and needs to mirror images by digest, this page no longer gives a matching STIG-FIPS tag, so they can pin the wrong image or assume the supported image is unavailable.

[github-actions]

Documentation preview

https://mellanox.github.io/network-operator-docs/review/pr-393