RFR: 8339852: Fix typos in java.compiler documentation [v3]

[Pavel Rappo]

> Please review this PR to fix typos and formatting issues. Some typos are trivial, others relate to domain vocabulary.

Pavel Rappo 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 four additional commits since the last revision:

 - Revert to "implementing"
 - Merge branch 'master' into 8339852
 - Dan's feedback
 - Initial commit

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20937/files
  - new: https://git.openjdk.org/jdk/pull/20937/files/76588ba0..9e2c153c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20937&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20937&range=01-02

  Stats: 14423 lines in 311 files changed: 8735 ins; 3715 del; 1973 mod
  Patch: https://git.openjdk.org/jdk/pull/20937.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20937/head:pull/20937

PR: https://git.openjdk.org/jdk/pull/20937