Change misleading comment about ModuleDoc.

[fidergo-stephane-gourichon]

Not calling ModuleDoc.__init__(self) causes duid to be unset and exceptions like this (see gregdavill/valentyusb#1 ).

Traceback (most recent call last):
File "mydesign.py", line 299, in
main()
File "mydesign.py", line 292, in main
generate_docs(soc, "build/"+target+"/documentation")
File ".../litex/litex/litex/soc/doc/init.py", line 98, in generate_docs
documented_region = DocumentedCSRRegion(
File ".../litex/litex/litex/soc/doc/csr.py", line 80, in init
docs = module.get_module_documentation()
File ".../litex/litex/litex/soc/integration/doc.py", line 141, in gatherer
return sorted(r, key=lambda x: x.duid)
File ".../litex/litex/litex/soc/integration/doc.py", line 141, in
return sorted(r, key=lambda x: x.duid)
File ".../litex/migen/migen/fhdl/module.py", line 136, in getattr
raise AttributeError("'"+self.class.name+"' object has no attribute '"+name+"'")
AttributeError: 'CDCUsbPHY' object has no attribute 'duid'

Acknowledgement

Thanks for zyp on #litex for hints. As zyp wrote: "unless there is a better way to solve it".

[mithro]

@xobs could you take a look at this?

[enjoy-digital]

It seems the issue was in ValentyUSB that was inheriting from both AutoDoc and ModuleDoc. With litex-hub/valentyusb@f1b485c we are now able to build the documentation correctly: ./orangecrab.py --uart-name=usb_acm --doc