RFR: JDK-8310814: Clarify the targetName parameter of Lookup::findClass [v2]

[Mandy Chung]

> This PR updates the spec of `Lookup::findClass` to reflect the current behavior that requires a binary name or a string representing an array class in the form as returned by `Class::getName`.    
> 
> `test/jdk/java/lang/invoke/accessClassAndFindClass/TestFindClass.java` already covers the test cases of a nested class and an array class.

Mandy Chung has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  8310833: Clarify the targetName parameter of Lookup::findClass

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Changes: https://git.openjdk.org/jdk/pull/14668/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14668&range=01
  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14668.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14668/head:pull/14668

PR: https://git.openjdk.org/jdk/pull/14668