RFR: 8258444: Clean up specifications of java.io.Reader.read(char[], int, int) in subclass overrides

[Brian Burkhalter]

8258444: Clean up specifications of java.io.Reader.read(char[],int,int) in subclass overrides

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Commit messages:
 - 8258444: Fix trailing whitesoace
 - 8258444: Clean up specifications of java.io.Reader.read(char[],int,int) in subclass overrides

Changes: https://git.openjdk.java.net/jdk/pull/2680/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2680&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258444
  Stats: 156 lines in 9 files changed: 41 ins; 57 del; 58 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2680.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2680/head:pull/2680

PR: https://git.openjdk.java.net/jdk/pull/2680