RFR: 6837: More formal tone in the agent settings

[Marcus Hirt]

Wasn't as bad as I remembered it.

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Commit messages:
 - 6837: More formal tone in the agent settings

Changes: https://git.openjdk.java.net/jmc/pull/118/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=118&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6837
  Stats: 14 lines in 2 files changed: 2 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/jmc/pull/118.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/118/head:pull/118

PR: https://git.openjdk.java.net/jmc/pull/118