RFR: 8339852: Fix typos in java.compiler documentation

[Pavel Rappo]

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

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/20937/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20937&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339852
  Stats: 61 lines in 17 files changed: 1 ins; 1 del; 59 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