[jdk16] RFR: 8257636: Update usage of "type" terminology in java.lang.Class and java.lang.reflect

[Julia Boes]

Another change to align with upcoming changes in the JLS terminology ('type' versus 'class and interface').

For background see: https://download.java.net/java/early_access/jdk16/docs/specs/class-terminology-jls.html

Where a class models types (as in the type of a variable or an expression), the change in terminology is mostly not applicable. For easier reviewing, paragraphs will only be reflowed before the PR is integrated.

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Commit messages:
 - first pass
 - update java.lang.Class

Changes: https://git.openjdk.java.net/jdk16/pull/36/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=36&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257636
  Stats: 56 lines in 14 files changed: 0 ins; 1 del; 55 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/36.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/36/head:pull/36

PR: https://git.openjdk.java.net/jdk16/pull/36