RFR: JDK-8292427: Improve specification of InflaterInputStream.fill()

[Lance Andersen]

Hi all,

This PR will update the javadoc to clarify the existing behavior of InflaterInputStream::fill as it currently omits the possibility that a EOFException may be thrown and that the protected `len` field is also updated by this method.

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Commit messages:
 - Clarify the javadoc for InflaterInputStream::fill

Changes: https://git.openjdk.org/jdk/pull/10945/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10945&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292427
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10945.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10945/head:pull/10945

PR: https://git.openjdk.org/jdk/pull/10945