RFR: 6465404: some problems in CellEditor related API docs

[Tejesh R]

JListBox is invalid component. CellTableEditor Interface doesn't support JComboBox and JTree components. Hence its removed from Documentation.

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Commit messages:
 - 6465404: some problems in CellEditor related API docs

Changes: https://git.openjdk.java.net/jdk/pull/6608/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6608&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6465404
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6608.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6608/head:pull/6608

PR: https://git.openjdk.java.net/jdk/pull/6608