In page https://www.postgresql.org/docs/current/indexes-bitmap-scans.html написано следующее: "Another example is that if we have separate indexes on x and y, one possible implementation of a query like WHERE x = 5 AND y = 6 is to use each index with the appropriate query clause and then AND together the index results to identify the result rows".
This is a correct and intended sentence. The paragraph for bitmap covers both OR from the earlier example and AND from this example.
