RFR: 8285485: Fix typos in corelibs [v3]

[Magnus Ihse Bursie]

> I ran `codespell` on modules owned by core-libs, 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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'master' into typos-in-corelibs
 - Fixes comments in review:
   
   * Reverting changes in jdwp.spec
   * Fix "is occurs"
   * Stop providing "Syncchronication" providers :-)
   * Fix fEncoder reduplication.
   * Revert changes in XMLEventReaderImpl.java
 - Pass #2 core
 - Pass #1 core
 - Pass #2 misc
 - Pass #1 misc

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8364/files
  - new: https://git.openjdk.java.net/jdk/pull/8364/files/b6c00de9..8bc35edb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8364&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8364&range=01-02

  Stats: 228368 lines in 2830 files changed: 173822 ins; 38520 del; 16026 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8364.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8364/head:pull/8364

PR: https://git.openjdk.java.net/jdk/pull/8364