RFR: 8257638: Update usage of "type" terminology in javax.lang.model

[Joe Darcy]

First pass at updating javax.lang.model's usage of the word "type" to correspond to changes in usage of "type" being made in JLS.

The wording in annotated construct and related functionality may need another pass.

Updating @jls tags to renamed JLS sections will be done under a different bug id.

Paragraphs *not* reflowed initially to easy reviewing. Paragraph will be reflowed and copyright year updated before a push is done.

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Commit messages:
 - Address comments from Alex Buckley.
 - Address code review feedback from jjg.
 - First cut at updating javax.lang.model to revised "type" terminology in JLS.

Changes: https://git.openjdk.java.net/jdk/pull/1726/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1726&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257638
  Stats: 110 lines in 17 files changed: 0 ins; 0 del; 110 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1726.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1726/head:pull/1726

PR: https://git.openjdk.java.net/jdk/pull/1726