blk-throttle: remove incorrect comment for tg_last_low_overflow_time

Function tg_last_low_overflow_time is called with intermediate node as
following:
throtl_hierarchy_can_downgrade
  throtl_tg_can_downgrade
    tg_last_low_overflow_time

throtl_hierarchy_can_upgrade
  throtl_tg_can_upgrade
    tg_last_low_overflow_time

throtl_hierarchy_can_downgrade/throtl_hierarchy_can_upgrade will traverse
from leaf node to sub-root node and pass traversed intermediate node
to tg_last_low_overflow_time.

No such limit could be found from context and implementation of
tg_last_low_overflow_time, so remove this limit in comment.

Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Kemeng Shi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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