RFR: 8277847: Support toolGuide tag in class-level documentation

[Jonathan Gibbons]

On Thu, 25 Nov 2021 15:58:58 GMT, Julia Boes <jboes at openjdk.org> wrote:

> This change adds support for the `@toolGuide` tag in class-level API documentation. 
> 
> (A use case is the jwebserver tool, where the com.sun.net.httpserver.SimpleFileServer class provides API points for extension and customization of the underlying server and its components. Linking to the tool's man page in the class-level documentation would be beneficial.)

Marked as reviewed by jjg (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6566