Auto merge of #20086 - servo:jdm-patch-6, r=aneeshusa
Auto merge of #20086 - servo:jdm-patch-6, r=aneeshusa

Add debug output to doc build.

This should narrow down the cause of https://github.com/servo/servo/issues/17243.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20086)
<!-- Reviewable:end -->

mbrubeck/servo,mbrubeck/servo,larsbergstrom/servo,fiji-flo/servo,notriddle/servo,splav/servo,nnethercote/servo,cbrewster/servo,peterjoel/servo,avadacatavra/servo,jimberlage/servo,ConnorGBrewster/servo,paulrouget/servo,canaltinova/servo,jimberlage/servo,pyfisch/servo,paulrouget/servo,canaltinova/servo,saneyuki/servo,SimonSapin/servo,ConnorGBrewster/servo,ConnorGBrewster/servo,cbrewster/servo,szeged/servo,avadacatavra/servo,pyfisch/servo,szeged/servo,DominoTree/servo,ConnorGBrewster/servo,mattnenterprise/servo,saneyuki/servo,emilio/servo,peterjoel/servo,mbrubeck/servo,pyfisch/servo,emilio/servo,avadacatavra/servo,cbrewster/servo,splav/servo,notriddle/servo,splav/servo,ConnorGBrewster/servo,jimberlage/servo,szeged/servo,avadacatavra/servo,ConnorGBrewster/servo,upsuper/servo,nnethercote/servo,mattnenterprise/servo,paulrouget/servo,KiChjang/servo,upsuper/servo,anthgur/servo,upsuper/servo,peterjoel/servo,KiChjang/servo,paulrouget/servo,peterjoel/servo,sadmansk/servo,saneyuki/servo,sadmansk/servo,splav/servo,larsbergstrom/servo,pyfisch/servo,nnethercote/servo,DominoTree/servo,mattnenterprise/servo,fiji-flo/servo,splav/servo,szeged/servo,splav/servo,sadmansk/servo,emilio/servo,notriddle/servo,saneyuki/servo,peterjoel/servo,SimonSapin/servo,SimonSapin/servo,notriddle/servo,DominoTree/servo,notriddle/servo,szeged/servo,anthgur/servo,peterjoel/servo,emilio/servo,larsbergstrom/servo,upsuper/servo,nnethercote/servo,mbrubeck/servo,anthgur/servo,saneyuki/servo,peterjoel/servo,saneyuki/servo,nnethercote/servo,dati91/servo,cbrewster/servo,larsbergstrom/servo,canaltinova/servo,KiChjang/servo,sadmansk/servo,notriddle/servo,canaltinova/servo,paulrouget/servo,splav/servo,avadacatavra/servo,sadmansk/servo,cbrewster/servo,peterjoel/servo,emilio/servo,splav/servo,ConnorGBrewster/servo,anthgur/servo,upsuper/servo,larsbergstrom/servo,dati91/servo,saneyuki/servo,notriddle/servo,mattnenterprise/servo,jimberlage/servo,SimonSapin/servo,saneyuki/servo,jimberlage/servo,fiji-flo/servo,jimberlage/servo,KiChjang/servo,cbrewster/servo,saneyuki/servo,szeged/servo,notriddle/servo,mattnenterprise/servo,mbrubeck/servo,peterjoel/servo,szeged/servo,fiji-flo/servo,fiji-flo/servo,DominoTree/servo,larsbergstrom/servo,pyfisch/servo,nnethercote/servo,dati91/servo,mbrubeck/servo,avadacatavra/servo,nnethercote/servo,dati91/servo,DominoTree/servo,sadmansk/servo,nnethercote/servo,jimberlage/servo,avadacatavra/servo,mattnenterprise/servo,canaltinova/servo,dati91/servo,pyfisch/servo,larsbergstrom/servo,canaltinova/servo,sadmansk/servo,dati91/servo,ConnorGBrewster/servo,emilio/servo,cbrewster/servo,splav/servo,emilio/servo,upsuper/servo,KiChjang/servo,DominoTree/servo,fiji-flo/servo,DominoTree/servo,paulrouget/servo,anthgur/servo,szeged/servo,canaltinova/servo,KiChjang/servo,avadacatavra/servo,upsuper/servo,KiChjang/servo,SimonSapin/servo,larsbergstrom/servo,pyfisch/servo,emilio/servo,pyfisch/servo,pyfisch/servo,jimberlage/servo,fiji-flo/servo,splav/servo,KiChjang/servo,canaltinova/servo,notriddle/servo,paulrouget/servo,DominoTree/servo,SimonSapin/servo,larsbergstrom/servo,nnethercote/servo,szeged/servo,KiChjang/servo,pyfisch/servo,mattnenterprise/servo,SimonSapin/servo,notriddle/servo,szeged/servo,mbrubeck/servo,dati91/servo,nnethercote/servo,emilio/servo,peterjoel/servo,upsuper/servo,paulrouget/servo,sadmansk/servo,paulrouget/servo,DominoTree/servo,emilio/servo,anthgur/servo,KiChjang/servo,mattnenterprise/servo,jimberlage/servo,saneyuki/servo,larsbergstrom/servo,anthgur/servo,anthgur/servo,paulrouget/servo,SimonSapin/servo,mbrubeck/servo,cbrewster/servo,dati91/servo,DominoTree/servo,fiji-flo/servo