Added potential TODO around State annotations

https://issues.jboss.org/browse/JBTM-2176
More changes to align with STM documentation.
Fixed typo in comment.
Added example for STM doc to reference.
Added the STM docs to the website building scripts
JBTM-2178. Use WFLYEJB0063 log id to detect unexpected REST transaction
Added a SharedHammer to better simulate vert.x
[JBTM-1369] Allow measurement to be cancelled
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JBTM-1369 Compare implementations
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