RFR: 6391806: JLabel and AbstractButton's imageUpdate method should be better specified [v4]

[Abhishek Kumar]

> JLabel and AbstractButton's imageUpdate method description updated.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  image changed to Image and newline added

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9240/files
  - new: https://git.openjdk.org/jdk/pull/9240/files/e32c4f9a..7e327402

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9240&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9240&range=02-03

  Stats: 6 lines in 2 files changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/9240.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9240/head:pull/9240

PR: https://git.openjdk.org/jdk/pull/9240