[docs] [issue21045] fix layout to generate documentation for Qt Assistant

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2a6c33592e40 by Georg Brandl in branch '3.4':
Closes #21045: make the Qt help build not look completely stupid
http://hg.python.org/cpython/rev/2a6c33592e40

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