RFR: 6595142: (spec) ByteArrayInputStream treats bytes, not characters

[Brian Burkhalter]

Replace the two occurrences of `character` with `byte`.

-------------

Commit messages:
 - 6595142: (spec) ByteArrayInputStream treats bytes, not characters

Changes: https://git.openjdk.org/jdk/pull/12505/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12505&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6595142
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12505.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12505/head:pull/12505

PR: https://git.openjdk.org/jdk/pull/12505