ConnectionType docs out-of-sync

The overview Threading docs (src/frameworks-technologies/threads.qdoc) say "Qt supports three types of signal-slot connections" (2 + 1 auto selection), but there are now 4 types of connections plus 2 types of auto selection between them.

While you're at it, it's not clear whether for BlockingQueuedConnection the emitter returns before or after the slot is executed (it says "delivered") which is ambiguous (the postman doesn't wait for you to read the letters he delivers).