fix: use Huawei Ascend as manufacturer name in roadmap

[mesutoezdil]

The roadmap used "Ascend" as the manufacturer name but device-supported.md and CNCF materials use "Huawei Ascend". Standardizes to the more specific and consistent name.

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[windsonsea]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mesutoezdil, windsonsea

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[hami-robot]

New changes are detected. LGTM label has been removed.

[rootsongjc]

One concern is that this PR only changes the roadmap while other documents still use "Ascend" mostly. We should probably decide whether the project prefers vendor names (NVIDIA, AMD, Huawei Ascend) or accelerator brands (CUDA, ROCm, Ascend, etc.) first, otherwise we may introduce inconsistent naming across the website.

Perhaps this should be discussed project-wide before merging.

[mesutoezdil]

Thanks for the feedback @rootsongjc. You are right
it is done now