[OpenJDK 2D-Dev] RFR: 6436374: Graphics.setColor(null) is not documented

[Prasanta Sadhukhan]

Document setting null setColor similar to way setFont(null) is documented.

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Commit messages:
 - 6436374: Graphics.setColor(null) is not documented

Changes: https://git.openjdk.java.net/jdk/pull/2371/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2371&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-6436374
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2371.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2371/head:pull/2371

PR: https://git.openjdk.java.net/jdk/pull/2371