Adds documentation for row-based replication flags #611
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Adds details on defaults for row-based replication flags (binlog_row_metadata, binlog_row_image) for MySQL and MariaDB.
By default binlog_row_metadata is set to 'MINIMAL'/'NO_LOG' respectively and the TableMapEvent does not contain the full row metadata.
By default_binlog_row_image_ is set to 'FULL' and the RowEvent contains full Rows. Only when the flag is set to 'MINIMAL' then ColumnBitmap1, ColumnBitmap2 and SkippedColumns are set to indicate the columns of each row that were not logged.