RFR: JDK-8310830: typo in the parameter name in @throws of ClassDesc::ofDescriptor

[Joe Darcy]

Typo fix. I didn't see any other instances of similar typos in the class.

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Commit messages:
 - JDK-8310830: typo in the parameter name in @throws of ClassDesc::ofDescriptor

Changes: https://git.openjdk.org/jdk/pull/14683/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14683&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310830
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14683.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14683/head:pull/14683

PR: https://git.openjdk.org/jdk/pull/14683