RFR: 5087440: (ch spec) java.io,nio bulk read(...) end-of-stream return value descriptions ambiguous

[Brian Burkhalter]

Minimal version of possible fixes: make the bulk read `@return` verbiage consistent in the `java.io` package.

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Commit messages:
 - 5087440: (ch spec) java.io,nio bulk read(...) end-of-stream return value descriptions ambiguous

Changes: https://git.openjdk.java.net/jdk/pull/8044/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8044&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-5087440
  Stats: 14 lines in 3 files changed: 5 ins; 0 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8044.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8044/head:pull/8044

PR: https://git.openjdk.java.net/jdk/pull/8044