<Swing Dev> RFR: 8263410: ListModel javadoc refers to non-existent interface

[Prasanta Sadhukhan]

ListModel class javadoc refers to ListDataModel interface but there is no ListDataModel interface. Rectified the anomaly.

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Commit messages:
 - 8263410: ListModel javadoc refers to non-existent interface

Changes: https://git.openjdk.java.net/jdk/pull/2931/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2931&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263410
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2931.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2931/head:pull/2931

PR: https://git.openjdk.java.net/jdk/pull/2931