git: openjdk/jdk: 8252399: Update mapMulti documentation to use type test pattern instead of instanceof once JEP 375 exits preview

[Patrick Concannon]

Changeset: fbe40e89
Author:    Patrick Concannon <pconcannon at openjdk.org>
Date:      2021-03-09 11:09:40 +0000
URL:       https://git.openjdk.java.net/jdk/commit/fbe40e89

8252399: Update mapMulti documentation to use type test pattern instead of instanceof once JEP 375 exits preview

Reviewed-by: dfuchs, psandoz, smarks

! src/java.base/share/classes/java/util/stream/Stream.java
+ test/jdk/java/util/stream/examples/JavadocExamples.java