Merge #10691: Trivial: Properly comment about shutdown process in ini…

…t.cpp file.

581c411 Properly comment about shutdown process in init.cpp file (Kyuntae Ethan Kim)

Pull request description:

Tree-SHA512: 8aaf739ca5eb2cf6f777b69a0d65f391ba311a33d2e23abc4d3008f90c6ef9da79d0683845abfc08978309f43409f0a7021663f8c564e157224c1dbe15138158

src/init.cpp

@@ -102,12 +102,11 @@ static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";
 // created by AppInit() or the Qt main() function.
 //
 // A clean exit happens when StartShutdown() or the SIGTERM
-// signal handler sets fRequestShutdown, which triggers
-// the DetectShutdownThread(), which interrupts the main thread group.
-// DetectShutdownThread() then exits, which causes AppInit() to
-// continue (it .joins the shutdown thread).
-// Shutdown() is then
-// called to clean up database connections, and stop other
+// signal handler sets fRequestShutdown, which makes main thread's
+// WaitForShutdown() interrupts the thread group.
+// And then, WaitForShutdown() makes all other on-going threads
+// in the thread group join the main thread.
+// Shutdown() is then called to clean up database connections, and stop other
 // threads that should only be stopped after the main network-processing
 // threads have exited.
 //