RFR: 8286983: rename jdb -trackvthreads and debug agent enumeratevthreads options and clarify "Preview Feature" nature of these options [v5]

[Chris Plummer]

On Mon, 6 Jun 2022 20:57:49 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

>> Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Don't capitalize "virtual threads"
>
> src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/TTYResources.java line 479:
> 
>> 477:              "                      connect to target VM using named connector with listed argument values\n" +
>> 478:              "    -dbgtrace [flags] print info for debugging {0}\n" +
>> 479:              "    -trackallthreads  Track all threads, including virtual threads.\n" +
> 
> should this start from lower case letter for consistency?

I debated which was better: start lower to be consistent with other help lines, or start with upper since there would be two sentences. I went with the latter.

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PR: https://git.openjdk.java.net/jdk/pull/8780