[bisq-network/bisq] Update docs references to Java 11 (#5432)

[BtcContributor]

As https://github.com/bisq-network/bisq/pull/5431 just got merged, Java 11 is the only supported Java version. 

Updated docs references to reflect this change.

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5432

-- Commit Summary --

  * Update references to Java 11

-- File Changes --

    M Makefile (2)
    M docs/build.md (4)
    M docs/idea-import.md (4)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5432.patch
https://github.com/bisq-network/bisq/pull/5432.diff

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