23.6 Container adaptors [container.adaptors]
23.6.1 In general [container.adaptors.general]
23.6.2 Header <queue> synopsis [queue.syn]
23.6.3 Class template queue [queue]
23.6.4 Class template priority_queue [priority.queue]
23.6.5 Class template stack [stack]
23.6.5.1 Header <stack> synopsis [stack.syn]

Why is [queue.syn] an rSec2 but [stack.syn] is an rSec3?
Why is the [stack.syn] header synopsis nested below the class that is defined in that header?

I think it would be more consistent to change [stack.syn] to rSec2 and either move it to come immediately after [queue.syn] so both synopses come before the class template definitions (matching how it's done in 23.4 [associative] and 23.5 [unord]) or else move it before [stack].