[PATCH v4] cpumask: add cpumask_var_t documentation

[KOSAKI Motohiro]

> > + * This code makes NR_CPUS length memcopy and bring memory corruption.
> 
> Maybe:
> 
> s/bring memory/brings to a memory/
> 
> ?
> 
> > + * cpumask_copy() privide safe copy functionality.
> s/privide/provides ?


Thank you.