docs(r/adbcdrivermanager): Better documentation for depth parameter #47

Job	Run time
check (macOS, adbcdrivermanager) / r-check	2m 34s
check (macOS, adbcflightsql) / r-check	2m 43s
check (macOS, adbcpostgresql) / r-check	2m 37s
check (macOS, adbcsnowflake) / r-check	2m 42s
check (macOS, adbcsqlite) / r-check	2m 28s
check (ubuntu, adbcdrivermanager) / r-check	1m 57s
check (ubuntu, adbcflightsql) / r-check	2m 52s
check (ubuntu, adbcsnowflake) / r-check	2m 43s
check (ubuntu, adbcpostgresql) / r-check	2m 9s
check (ubuntu, adbcsqlite) / r-check	2m 11s
check (windows, adbcflightsql) / r-check	2m 41s
check (windows, adbcpostgresql) / r-check	2m 42s
check (windows, adbcdrivermanager) / r-check	2m 44s
check (windows, adbcsnowflake) / r-check	2m 41s
check (windows, adbcsqlite) / r-check	2m 43s
	38m 27s

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