Docs: fix broken hashes in Settings.cpp

[Blargian]

Fixes two instances of #setting_max_block_size -> #max_block_size

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[robot-ch-test-poll3]

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Successful checks

Check name	Description	Status
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Docs check	Builds and tests the documentation	✅ success
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Integration tests	The integration tests report. In parenthesis the package type is given, and in square brackets are the optional part/total tests	✅ success
Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	✅ success
Stateless tests	Runs stateless functional tests for ClickHouse binaries built in various configurations -- release, debug, with sanitizers, etc	✅ success
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