RFR: JDK-6998249: Wrong behavior/Javadoc of JTable.tableChanged(TableModelEvent e)

[Harshitha Onkar]

Updated JTable's tableChanged() method docs to explicitly mention the coordinate system of the rows and columns.

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Commit messages:
 - updated JTable docs for tableChanged method

Changes: https://git.openjdk.java.net/jdk/pull/7253/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7253&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6998249
  Stats: 5 lines in 1 file changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7253.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7253/head:pull/7253

PR: https://git.openjdk.java.net/jdk/pull/7253