RFR: 8309819: Clarify API note in Class::getName and MethodType::toMethodDescriptorString [v10]

[Chen Liang]

> The API specification for descriptorString not being a strict inverse of Class::forName and MethodType::fromDescriptorString are not entirely correct.
> 
> 1. Class::descriptorString was never an inverse of Class::forName, which takes a binary name instead. The note about different class loaders is moved to getName, as ClassDesc requires an explicit lookup for resolution already.
> 2. MethodType::toMethodDescriptorString ends with a meaningless sentence: "fromMethodDescriptorString, because the latter requires a suitable class loader argument.", and the "Note:" section can be replaced with an `@apiNote`.
> 3. Both of these didn't mention hidden classes (or other non-nominally-describable classes) as a reason that prevents the inversion operation, in addition to distinct class loaders. Added valid method type descriptor/binary name as a prerequisite for the distinct class loader explanation.
> 
> A few user-defined anchor links are replaced with updated javadoc link tag format as well. The explicit html-style links in `@see` tags are unchanged in order to retain the non-code output.
> 
> The rendered specifications:
> https://cr.openjdk.org/~liach/8309819/06/java.base/java/lang/Class.html
> https://cr.openjdk.org/~liach/8309819/06/java.base/java/lang/invoke/MethodType.html

Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 15 additional commits since the last revision:

 - Merge branch 'master' into fix/descstring-spec
 - Update the distinct class note, thanks to mandy
 - Merge branch 'master' into fix/descstring-spec
 - produce identical component descriptors in descriptor strings -> cannot be distinguished in descriptor strings
 - Reword of the distinct-class-same-descriptor note
 - Missed recommendations from Alan
 - Review and updates for 8310242
 - Merge branch 'master' into fix/descstring-spec
 - Update the note for getName
 - Convert the note in fromDescriptorString to apiNote
 - ... and 5 more: https://git.openjdk.org/jdk/compare/4ca10ecb...ef7004e4

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14411/files
  - new: https://git.openjdk.org/jdk/pull/14411/files/3bea7506..ef7004e4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14411&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14411&range=08-09

  Stats: 10497 lines in 446 files changed: 4025 ins; 3413 del; 3059 mod
  Patch: https://git.openjdk.org/jdk/pull/14411.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14411/head:pull/14411

PR: https://git.openjdk.org/jdk/pull/14411