RFR: 8276164: RandomAccessFile#write method could throw IndexOutOfBoundsException that is not described in javadoc

[Masanori Yano]

Could you please review the 8276164 bug fixes?

I suggest adding the missing javadoc of `@throws IndexOutOfBoundsException`.

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Commit messages:
 - 8276164: RandomAccessFile#write method could throw IndexOutOfBoundsException that is not described in javadoc

Changes: https://git.openjdk.java.net/jdk/pull/6168/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6168&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276164
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6168.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6168/head:pull/6168

PR: https://git.openjdk.java.net/jdk/pull/6168