docs: clarify CPU burst behavior on cgroup v2

[miantalha45]

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/kind documentation

What this PR does / why we need it:
Updates the colocation documentation to correctly describe CPU Burst on cgroup v2.

• Documents cpu.max.burst as the configuration interface for cgroup v2.
• Clarifies that missing nr_bursts and burst_usec fields in cpu.stat do not prove CPU Burst is disabled.
• Distinguishes cgroup v1 burst_time from cgroup v2 burst_usec.
• Adds guidance for locating the actual container cgroup.
• Replaces the outdated OpenEuler-only statement with generic Linux and kernel-interface requirements.
• Makes the CPU Burst quota example aware of both cgroup v1 and v2.

Which issue(s) this PR fixes:
NA

Special notes for your reviewer:
AI assistance is used for Chinese documentation update.

[gemini-code-assist]

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[miantalha45]

@JesseStutler have a look on it.