Doc: Include namespaces in TOC


The QtCoap namespace was missing from the TOC as the .qhp subproject
selected only classes and headers.

Pick-to: 6.12
Change-Id: If341bfd01ae2b424238a52f0a48b04017a0284c3
Reviewed-by: Alexei Cazacov <alexei.cazacov@qt.io>
commit70720c5c0b4580e0e4173fbce4659e18bbe92803
parent9591b946c4640b78158a2e584456af27be8b7845
authorTopi Reinio <topi.reinio@qt.io>
committerTopi Reinio <topi.reinio@qt.io>
commit timeWed, 21 Oct 2026 07:52:30 +0000