8342646: JTREG_TEST_THREAD_FACTORY in testing.md should be TEST_THREAD_FACTORY

[sendaoYan]

Hi all,
In make/RunTests.gmk, the keyword is 'TEST_THREAD_FACTORY'.

So the below test command will print error:

make test TEST=test/jdk/java/math/BigInteger/TestValueExact.java CONF=linux-x86_64-server-release JTREG="JTREG_TEST_THREAD_FACTORY=Virtual"

Building target 'test' in configuration 'linux-x86_64-server-release'
JTREG_TEST_THREAD_FACTORY=Virtual is not a valid keyword for JTREG.
Valid keywords: JOBS TIMEOUT_FACTOR FAILURE_HANDLER_TIMEOUT TEST_MODE ASSERT VERBOSE RETAIN TEST_THREAD_FACTORY MAX_MEM RUN_PROBLEM_LISTS RETRY_COUNT REPEAT_COUNT MAX_OUTPUT REPORT OPTIONS JAVA_OPTIONS VM_OPTIONS KEYWORDS EXTRA_PROBLEM_LISTS LAUNCHER_OPTIONS.
RunTests.gmk:206: *** Cannot continue. Stop.

So I think we should fix the document bug in doc/testing.md to avoid take the same mistake. Trivial fix, no risk.

---

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• JDK-8342646: JTREG_TEST_THREAD_FACTORY in testing.md should be TEST_THREAD_FACTORY (Bug - P4)

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