RFR: 6391806: JLabel and AbstractButton's imageUpdate method should be better specified [v2]

[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:

  JLabel and Abstract Button's imageUpdate method description changed

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9240/files
  - new: https://git.openjdk.org/jdk/pull/9240/files/a16566a4..1e69df0d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9240&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9240&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 2 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