Improve server_test and instructions on homebrew and dynamic config docs

[longquanzheng]

What changed?
Improve server_test and instructions on homebrew

Why?

How did you test it?
N/A

Potential risks
No

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build fb3b6355-ec6e-4e3d-94be-dbef7da4bdd2

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 79 unchanged lines in 12 files lost coverage.
• Overall coverage increased (+0.006%) to 56.817%

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Files with Coverage Reduction	New Missed Lines	%
common/membership/rpServiceResolver.go	2	73.58%
common/task/fifoTaskScheduler.go	2	84.54%
common/task/weightedRoundRobinTaskScheduler.go	2	89.64%
service/history/execution/mutable_state_builder.go	2	69.77%
service/history/queue/timer_queue_processor.go	2	59.33%
service/history/shard/context.go	2	66.69%
service/matching/matcher.go	2	91.46%
service/matching/taskListManager.go	2	74.09%
common/cache/lru.go	3	90.73%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	3	55.49%

Totals
Change from base Build abdd87f0-e244-4789-996a-013e1a186c92:	0.006%
Covered Lines:	81261
Relevant Lines:	143022

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💛 - Coveralls

[longquanzheng]

to reviewers: I change this file so that the default values are reflecting what should be set in the yaml format. I have seen many people got confused, for example they tried to use 256 * 1024 in the yaml.