qtdoc-opensource-src is marked for autoremoval from testing

[Debian testing autoremoval watch]

qtdoc-opensource-src 5.11.1-1 is marked for autoremoval from testing on 
2018-10-08

It (build-)depends on packages with these RC bugs:
907249: qml-module-qtwebview: "No WebView plug-in found!" when -dev packages 
are not installed