RFR: Updated section on Code Conventions. [v2]

[Andreas Lundblad]

On Wed, 24 Jun 2020 22:11:23 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Andreas Lundblad has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - Moved Javadoc guidelines to comments section.
>>  - Joined code blocks into a single one in hgHelp and tClone.
>>  - Changed from ``` to ~~~, and from 'document' to 'section'
>
> src/codeConventions.md line 17:
> 
>> 16:
>> 17: <ol class="spread">
>> 18:     <li>Correctness</li>
> 
> Not sure if I'm looking at the latest commit here, but if I do this part should be converted to markdown as well.

Ops. Had forgotten this file. Done.

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PR: https://git.openjdk.java.net/guide/pull/14