RFR: Updated intro

[Magnus Ihse Bursie]

On Tue, 2 Jun 2020 01:20:59 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> I re-wrote the intro to talk more about the present and less about the past.

Changes requested by ihse (no project role).

src/intro.md line 32:

> 31:
> 32: ## Maintenance
> 33:

A "Maintenance" heading in the intro sounds like maintenance on OpenJDK itself.

The maintenance on the guide itself is rather un-interesting. Maybe you should add a trailing chapter "About this
Guide" or something like that, where you can put stuff like that.

src/intro.md line 9:

> 8:
> 9: The OpejJDK project governs the Java programming language and the Java runtime.
> 10: The project was created when the JDK was first released under the GPLv2 license in May

Typo "Opej".

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PR: https://git.openjdk.java.net/guide/pull/15