Docs: Fix markdown formatting

refs #7387
Implement an experimental variable to limit the number of threads
Comment out InitializeProcThreadAttributeList (for now)

fixes #7681
Syntax: Add missing keywords
Update AUTHORS
Build fix for RHEL 5
Release version 2.2.0
Provide a specialized function overload for Convert::ToDouble(const Value&)
Clean up the DebugHint class
Add an option that hides CLI commands

fixes #7702
Native codegen (WIP)