Clarify the enabled property in database_metrics configuration descriptions for sqlserver #20664

Job	Run time
test / compute-matrix / Compute matrix	13s
test / test (windows, windows-2019, sqlserver, SQL Server on Windows) / SQL Server on Windows	2m 47s
test / test (linux, ubuntu-20.04, sqlserver, SQL Server on Linux) / SQL Server on Linux	2m 51s
test / check	1s
test / save-event	1s
test / submit-traces	1s
	5m 54s

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