RFR: 7903067: JMH: Improve English grammar in error messages [v3]

[Aarre Laakso]

> I improved the English grammar in a few error messages

Aarre Laakso has updated the pull request incrementally with one additional commit since the last revision:

  Further grammatical changes

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Changes:
  - all: https://git.openjdk.java.net/jmh/pull/56/files
  - new: https://git.openjdk.java.net/jmh/pull/56/files/0f51cc06..99be8bfa

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmh&pr=56&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmh&pr=56&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmh/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/56/head:pull/56

PR: https://git.openjdk.java.net/jmh/pull/56