RFR: 8273609: Fix trivial doc typos in the compiler area

[Pavel Rappo]

8273609: Fix trivial doc typos in the compiler area

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.java.net/jdk/pull/5471/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5471&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273609
  Stats: 16 lines in 7 files changed: 0 ins; 0 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5471.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5471/head:pull/5471

PR: https://git.openjdk.java.net/jdk/pull/5471