RFR: 8300792: Refactor examples in java.net.http to use @snippet

[Darragh Clarke]

On Tue, 21 Feb 2023 16:08:03 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> Other places in the JDK are using:
> 
> ```
> {@snippet lang=java :
> ```
> 
> Since all our snippets are java code we may want to do that too.

I wouldn't mind changing it to specify, though I do think if no value is set it defaults to java, at least from reading the JEP thats what I thought

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PR: https://git.openjdk.org/jdk/pull/12692