<Swing Dev> RFR: 8263170: ComboBoxModel documentation refers to a nonexistant type

[Prasanta Sadhukhan]

javadoc of ComboBoxModel incorrectly specifies "extends ListDataModel" but actually it extends ListModel and there is no such interface as ListDataModel. Rectified the anomaly.

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Commit messages:
 - 8263170: ComboBoxModel documentation refers to a nonexistant type

Changes: https://git.openjdk.java.net/jdk/pull/2886/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2886&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263170
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2886.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2886/head:pull/2886

PR: https://git.openjdk.java.net/jdk/pull/2886