RFR: Fixed links and a few other minor changes

[Jesper Wilhelmsson]

On Tue, 21 Jun 2022 16:17:25 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Changed openjdk.java.net to openjdk.org.
>
> src/guide/about-this-guide.md line 5:
> 
>> 3: This guide is being maintained through the [OpenJDK Developers' Guide Project](https://openjdk.org/census#guide). The [source repository](https://github.com/openjdk/guide) is available at GitHub. The revision hash at the bottom of this page refers to the last published commit.
>> 4: 
>> 5: Comments and questions may be sent to [guide-dev (at) openjdk.org](mailto:guide-dev-at-openjdk.org). Please let us know if there's anything in the guide that isn't clear.
> 
> Should the email address be a link? If you click it, you'll be unable to send the email until you edit the address and replace `-at-` with `@`.
> 
> The email addresses in the `code-owners.md` file are the real ones. Does it make sense to update this one to be the correct email address of the mailing list?

Actually that is a good point. Initially this was done to stop spam bots from collecting addresses. But these days I doubt any bot is stopped by the "-at-" or "(at)" style (if they ever were). I'll bring this up in a later patch as there probably are a few instances of this that needs to be fixed throughout the guide.

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

PR: https://git.openjdk.org/guide/pull/89