RFR: Copy edits, terminology fixes, and factual corrections to the README and the introduction

[Jesper Wilhelmsson]

On Thu, 18 Jun 2020 21:37:45 GMT, Mark Reinhold <mr at openjdk.org> wrote:

> - Change “OpenJDK community” to “OpenJDK Community”
> - Omit needless words
> - s/like/such as/g
> - Fix various typos and grammatical errors
> - Tone down “contains the defacto standard” to “suggests”
> - The OpenJDK Community was launched in November 2006, not May 2007

Thank you for these changes!  Just a minor typo to fix before pushing.

README.md line 21:

> 20: for experienced contributors. Any descriptions in the Guide should thus be self-contained
> 21: or have explicit references to any information thata the reader is expected to already know. The information
> 22: should also be structured in such a way that it's easy to find the details for any process, so that

"thata" -> "that" ?

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Marked as reviewed by jwilhelm (Lead).

PR: https://git.openjdk.java.net/guide/pull/18