RFR: 8311020: Typo cleanup in Classfile API

Wed Jun 28 06:17:28 UTC 2023

This is a cleanup patch that fixes:
1. `ClassfileBuilder` should be sealed but was not; it's now sealed.
2. Various typo fixes, including spelling errors, wrong descriptions, and unnecessary full qualifications for classes in the same package.

Requesting a review from @asotona. There's a few other more complex issues discovered, which I will describe on the mailing list to elicit a discussion for best solutions.

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Commit messages:
 - 8311020: Typo cleanup in Classfile API

Changes: https://git.openjdk.org/jdk/pull/14687/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14687&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311020
  Stats: 49 lines in 28 files changed: 3 ins; 3 del; 43 mod
  Patch: https://git.openjdk.org/jdk/pull/14687.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14687/head:pull/14687

PR: https://git.openjdk.org/jdk/pull/14687