kernel/kcov.c: fix typos in kcov_remote_start documentation

 * kcov_remote_handle() with KCOV_SUBSYSTEM_COMMON as the subsystem id and an

 * arbitrary 4-byte non-zero number as the instance id). This common handle

 * then gets saved into the task_struct of the process that issued the

 * KCOV_REMOTE_ENABLE ioctl. When this proccess issues system calls that spawn

 * kernel threads, the common handle must be retrived via kcov_common_handle()

 * KCOV_REMOTE_ENABLE ioctl. When this process issues system calls that spawn

 * kernel threads, the common handle must be retrieved via kcov_common_handle()

 * and passed to the spawned threads via custom annotations. Those kernel

 * threads must in turn be annotated with kcov_remote_start(common_handle) and

 * kcov_remote_stop(). All of the threads that are spawned by the same process