RFR: 8271268: Fix Javadoc links for Stream.mapMulti [v3]

[Mourad Abbay]

> Fix Javadoc links for Stream.mapMulti, Stream.MapMultiInt, Stream.mapMultiToInt, Stream.mapMultiToLong and Stream.mapMultiToDouble.

Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:

  Display links to Stream.flatMap and Stream.mapMulti without parameters.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15794/files
  - new: https://git.openjdk.org/jdk/pull/15794/files/8e9f38ac..7e3b5b59

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15794&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15794&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15794.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15794/head:pull/15794

PR: https://git.openjdk.org/jdk/pull/15794