RFR: JDK-8275368: Correct statement of kinds of elements Processor.process operates over

[Joe Darcy]

Correcting docs of Processor.process to not imply that type elements are the only kind of element processed.

Updated lines left un-reflowed to ease review. I'll reflow paragraphs and update copyright years before pushing.

Please also review the corresponding CSR:

https://bugs.openjdk.java.net/browse/JDK-8275369

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Commit messages:
 - JDK-8275368: Correct statement of kinds of elements Processor.process operates over

Changes: https://git.openjdk.java.net/jdk/pull/5982/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5982&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275368
  Stats: 11 lines in 2 files changed: 7 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5982.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5982/head:pull/5982

PR: https://git.openjdk.java.net/jdk/pull/5982