RFR: 8310242: Clarify the name parameter to Class::forName

[Mandy Chung]

This PR clarifies the spec of the 3-arg Class::forName  regarding the format of the name for an array type which is of the form: one or more of "[" + binary name of the element type + ";'.

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Commit messages:
 - 8310242: Clarify the name parameter to Class::forName

Changes: https://git.openjdk.org/jdk/pull/14528/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14528&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310242
  Stats: 18 lines in 1 file changed: 5 ins; 1 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/14528.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14528/head:pull/14528

PR: https://git.openjdk.org/jdk/pull/14528