Update some comments

nshlib/nsh_timcmds.c

@@ -319,6 +319,8 @@ int cmd_time(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
       struct timespec end;
       struct timespec diff;
 
+      /* Get and print the elapsed time */
+
       ret = clock_gettime(TIME_CLOCK, &end);
       if (ret < 0)
         {
@@ -340,6 +342,8 @@ int cmd_time(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
         }
     }
 
+  /* Restore state */
+
   vtbl->np.np_bg       = bgsave;
   vtbl->np.np_redirect = redirsave;
   return ret;