### What this PR does / why we need it?
This PR clarifies the CPU binding documentation for managing the
`irqbalance` service.
The previous wording only mentioned Ubuntu while the command shown is
specific to systemd-based Linux distributions. This update describes the
command as applicable to Ubuntu and other systemd-based distributions,
and adds a note for non-systemd systems to use the distribution-specific
service-management command.
### Does this PR introduce _any_ user-facing change?
No. This is a documentation-only update and does not change vLLM or
vllm-ascend runtime behavior.
### How was this patch tested?
Signed-off-by: chenchuw886 <chenchuw@huawei.com>
Co-authored-by: chenchuw886 <chenchuw@huawei.com>
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