RFR: JDK-8179537 Update testing.md for more clarity regarding JTReg configuration

[Magnus Ihse Bursie]

Jon pointed out in private conversation that the test suite should be 
written "JTReg", not "JTreg". I've updated both the new text and all old 
instances.

New webrev: 
http://cr.openjdk.java.net/~ihse/JDK-8179537-update-testing-readme-about-jtreg-configuration/webrev.02

/Magnus

On 2017-06-16 22:05, Magnus Ihse Bursie wrote:
> Thanks to user feedback, this patch adds a section to testing.md about 
> the need to configure the JTreg framework for run-test to be able to 
> work, and describes some ways to achieve this.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8179537
> WebRev: 
> http://cr.openjdk.java.net/~ihse/JDK-8179537-update-testing-readme-about-jtreg-configuration/webrev.01
>
> Generated html file: 
> http://cr.openjdk.java.net/~ihse/JDK-8179537-update-testing-readme-about-jtreg-configuration/webrev.01/raw_files/new/common/doc/testing.html
>
> /Magnus
>