RFR: JDK-8271227: Missing `{@code }` in com.sun.source.*

[Jonathan Gibbons]

Please review a simple `noreg-doc` update to files in the `com.sun.source.*` API, to enclose type names in the descriptions in doc comments with `{@code }`. 

Apart from fixing one typo, the changes are all formatting changes, with no changes to the content of the spec, so no CSR.

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Commit messages:
 - JDK-8271227: Missing `{@code }` in com.sun.source.*

Changes: https://git.openjdk.java.net/jdk/pull/5133/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5133&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271227
  Stats: 133 lines in 3 files changed: 0 ins; 0 del; 133 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5133.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5133/head:pull/5133

PR: https://git.openjdk.java.net/jdk/pull/5133