Remove superfluous TODO

Author: horenmar

src/catch2/internal/catch_run_context.hpp

@@ -140,7 +140,6 @@ namespace Catch {
     private:
 
         void handleUnfinishedSections();
-        // TODO: Make this a recursive mutex if we use a single big mutex in the fatal error handler
         mutable Detail::Mutex m_assertionMutex;
         TestRunInfo m_runInfo;
         TestCaseHandle const* m_activeTestCase = nullptr;