RFR: 8247591: Document Alpine Linux build steps in OpenJDK build guide

[Erik Joelsson]

On Mon, 5 Oct 2020 18:13:49 GMT, Aleksei Voitylov <avoitylov at openjdk.org> wrote:

> Please review the build guide update for Alpine Linux.
> 
> building.html was generated by "make update-build-docs". However, this command produced a slightly different
> building.html, with some other sections modified as well. This is probably due to another version of the tooling
> installed. I have manually removed the modifications to other, not relevant sections of the building.html change
> introduced by the tool, and kept only the changes relevant to the md file change.

Looks good!
Thanks for adjusting the output from your version of pandoc. Reducing the churn from different tool versions is
appreciated.

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Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/512