update description of cpu_affinity_final

Signed-off-by: keisku <[email protected]>

src/runtime/process.rs

@@ -592,7 +592,8 @@ pub struct ExecCPUAffinity {
  )]
  /// cpu_affinity_final is a list of CPUs the process will be run on after the transition
  /// to container's cgroup. The format is the same as for `initial`. If omitted or empty,
- /// the container's default CPU affinity, as defined by cpu.cpus property, is used.
+ /// runtime SHOULD NOT change process' CPU affinity after the process is moved to
+ /// container's cgroup, and the final affinity is determined by the Linux kernel.
  cpu_affinity_final: Option<String>,
 }