RFR: 8285366: Fix typos in serviceability [v3]

[Magnus Ihse Bursie]

> I ran `codespell` on modules owned by the serviceability team (`java.instrument java.management.rmi java.management jdk.attach jdk.hotspot.agent jdk.internal.jvmstat jdk.jcmd jdk.jconsole jdk.jdi jdk.jdwp.agent jdk.jstatd jdk.management.agent jdk.management`), and accepted those changes where it indeed discovered real typos.
> 
> 
> I will update copyright years using a script before pushing (otherwise like every second change would be a copyright update, making reviewing much harder).
> 
> The long term goal here is to make tooling support for running `codespell`. The trouble with automating this is of course all false positives. But before even trying to solve that issue, all true positives must be fixed. Hence this PR.

Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8334/files
  - new: https://git.openjdk.java.net/jdk/pull/8334/files/ad36a59a..4490ef75

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8334&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8334&range=01-02

  Stats: 117 lines in 117 files changed: 0 ins; 0 del; 117 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8334.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8334/head:pull/8334

PR: https://git.openjdk.java.net/jdk/pull/8334