Update error message for too frequent domain updates

[vytautas-karpavicius]

What changed?
Updated error message when doing too frequent domain updates.

Why?
Returned cooldown error The domain failovers too frequent. is confusing when performing regular domain update (not a failover)

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 75bd0e2d-1cf3-479c-98ac-1ca9dcab1d50

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 113 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.04%) to 56.903%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weightedRoundRobinTaskScheduler.go	2	89.12%
common/cache/lru.go	3	90.73%
service/history/task/fetcher.go	4	86.15%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	6	55.04%
service/history/shard/context.go	8	66.27%
common/persistence/sql/sqlExecutionStore.go	16	61.45%
common/persistence/nosql/nosqlplugin/cassandra/workflowParsingUtils.go	34	83.65%
common/persistence/nosql/nosqlplugin/cassandra/workflowUtils.go	40	75.11%

Totals
Change from base Build 0ab6bd73-5539-4a61-9af5-4d81a5f6e93d:	-0.04%
Covered Lines:	83009
Relevant Lines:	145879

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💛 - Coveralls