There is what seems to be a small typo in the Introduction to QDoc manual page.

Under the Why Standard Mode Is Slow section, the 4th paragraph reports that:

[...]
When a Qt module contains links into the documentation of other Qt module's, that module is said to depend on those other Qt modules. Hence when QDoc runs the generate phase for that module, it must also load the index files for those modules so it can create those thinks.

I think that the intended word might have been things instead of thinks.

Albeit, I would suggest correcting it to links, as it feels a bit more consistent with the previous text in the paragraph without feeling like a repetition.

The typo appears in at least the equivalent Qt5 documentation page too.