[Qt-creator] How to build Qt Creator documentation from the sources

[Artur Shepilko]

> /home/szyk/!-ściągnięte/build-qtcreator-Desktop_Qt_5_9_6_GCC_64bit-Release/share/doc/qtcreator/qtcreator-dev.qch
>
> Is suppose to expose only one document in table of content named: "Extending
> Qt Creator Manual"?!?
>

I'm not sure what docs you're updating, but  as long as they fit into
the existing qtcreator doc hierarchy, the changes will be picked up
and included in the resulting .qch files with updated links and TOC:

ls share/doc/qtcreator/