RFR: Updates to the JBS section of the OpenJDK Dev Guide

[Joe Darcy]

On Tue, 14 Mar 2023 17:56:18 GMT, calnan <duke at openjdk.org> wrote:

> Added overview on triaging issues, the bug states and process.

src/guide/jbs-jdk-bug-system.md line 32:

> 30: </tr>
> 31: <tr>
> 32:     <td class="dictionary"><i>Improvement</i></td>

When you go to create a bug in JBS, the issue types available include "Bug", "Enhancement", "JEP", etc. not "Improvement" -- the guide should match JBS terminology.

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PR Review Comment: https://git.openjdk.org/guide/pull/100#discussion_r1145439395