Fixed comment during refactoring

[dkrotx]

Also renamed variable as r looks too short and stands more for reader
or ref rather than response/result.

comment to make more obvious since we talk about "send on closed channel" error here

Refactoring during deep dive session

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Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018fe9e0-42b0-480c-8dab-bca19aed9094

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 151 unchanged lines in 14 files lost coverage.
• Overall coverage decreased (-0.08%) to 70.654%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
common/backoff/retry.go	2	92.11%
common/task/fifo_task_scheduler.go	2	85.57%
service/history/task/transfer_active_task_executor.go	2	72.77%
common/persistence/historyManager.go	2	66.67%
service/history/task/task.go	3	84.81%
service/matching/tasklist/task_list_manager.go	3	75.89%
bench/lib/client.go	4	0.0%
service/matching/config/config.go	4	91.49%
service/history/task/fetcher.go	4	85.05%

Totals
Change from base Build 018fe9dc-483b-4c68-acea-8033170f8941:	-0.08%
Covered Lines:	105240
Relevant Lines:	148951

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💛 - Coveralls