RFR: 7903683 Document how to run individual self-tests [v4]

[Ludvig Janiuk]

On Wed, 27 Mar 2024 17:04:02 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Ludvig Janiuk has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   no need for --
>
> doc/building.md line 114:
> 
>> 112: [ControlTest.gmk](../test/ctrl/ControlTest.gmk) makefile has a `$(BUILDTESTDIR)/ControlTest.ok`
>> 113: target which runs one of the self-tests. In order to run that individual test, use the following
>> 114: command:
> 
> "the" is too specific.  Suggest changing to: _use a command such as the following:_

Agree, changing.

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PR Review Comment: https://git.openjdk.org/jtreg/pull/184#discussion_r1541514214