RFR: 6453640: BandedSampleModel.createCompatibleSampleModel() API docs are wrong

[Phil Race]

This corrects some omissions / errors in BandedSampleModel docs and adds a test to verify them.

-------------

Commit messages:
 - 6453640

Changes: https://git.openjdk.org/jdk/pull/27806/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27806&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6453640
  Stats: 108 lines in 2 files changed: 100 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27806.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27806/head:pull/27806

PR: https://git.openjdk.org/jdk/pull/27806