docs - update sync/scan (#29524)

docs/README.md

docs/configuring-metabase/settings.md

docs/data-modeling/metadata-editing.md

docs/databases/connecting.md

docs/databases/connections/athena.md

docs/databases/connections/bigquery.md

docs/databases/connections/druid.md

docs/databases/connections/h2.md

docs/databases/connections/mysql.md

docs/databases/connections/postgresql.md

docs/databases/connections/presto.md

docs/databases/connections/redshift.md

docs/databases/connections/snowflake.md

docs/databases/connections/sparksql.md

docs/databases/connections/sql-server.md

docs/databases/connections/sqlite.md

docs/databases/images/re-scan-options.png

docs/databases/images/scanning-options.png

docs/databases/sync-scan.md

docs/developers-guide/drivers/multimethods.md