RFR: 8294533: Documentation mistake in Process::getErrorStream and getInputStream

[Roger Riggs]

Correct javadoc links and references.

The links should refer to the method `()` instead of field.

The apiNote in `getErrorStream` should refer to the error stream not the input stream and reader.

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Commit messages:
 - 8294533: Documentation mistake in Process::getErrorStream and getInputStream

Changes: https://git.openjdk.org/jdk/pull/10492/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10492&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294533
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/10492.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10492/head:pull/10492

PR: https://git.openjdk.org/jdk/pull/10492