style: Add a comment about pre_process_children_hook.
style: Add a comment about pre_process_children_hook.

cbrewster/servo,szeged/servo,cbrewster/servo,peterjoel/servo,avadacatavra/servo,splav/servo,splav/servo,emilio/servo,canaltinova/servo,nnethercote/servo,cbrewster/servo,ConnorGBrewster/servo,jimberlage/servo,splav/servo,notriddle/servo,DominoTree/servo,SimonSapin/servo,cbrewster/servo,DominoTree/servo,rnestler/servo,mbrubeck/servo,anthgur/servo,fiji-flo/servo,eddyb/servo,upsuper/servo,ConnorGBrewster/servo,rnestler/servo,avadacatavra/servo,dati91/servo,mbrubeck/servo,sadmansk/servo,cbrewster/servo,saneyuki/servo,splav/servo,jimberlage/servo,mattnenterprise/servo,dati91/servo,notriddle/servo,ConnorGBrewster/servo,eddyb/servo,rnestler/servo,mattnenterprise/servo,mattnenterprise/servo,emilio/servo,DominoTree/servo,cbrewster/servo,larsbergstrom/servo,pyfisch/servo,thiagopnts/servo,saneyuki/servo,peterjoel/servo,larsbergstrom/servo,jimberlage/servo,paulrouget/servo,anthgur/servo,anthgur/servo,notriddle/servo,paulrouget/servo,sadmansk/servo,peterjoel/servo,nnethercote/servo,dsandeephegde/servo,szeged/servo,peterjoel/servo,saneyuki/servo,splav/servo,KiChjang/servo,canaltinova/servo,avadacatavra/servo,pyfisch/servo,emilio/servo,pyfisch/servo,saneyuki/servo,SimonSapin/servo,jimberlage/servo,notriddle/servo,paulrouget/servo,avadacatavra/servo,cbrewster/servo,ConnorGBrewster/servo,anthgur/servo,sadmansk/servo,nnethercote/servo,notriddle/servo,upsuper/servo,upsuper/servo,KiChjang/servo,CJ8664/servo,emilio/servo,mbrubeck/servo,szeged/servo,sadmansk/servo,nnethercote/servo,dsandeephegde/servo,thiagopnts/servo,thiagopnts/servo,thiagopnts/servo,eddyb/servo,SimonSapin/servo,canaltinova/servo,saneyuki/servo,dati91/servo,notriddle/servo,dsandeephegde/servo,DominoTree/servo,eddyb/servo,dati91/servo,larsbergstrom/servo,dati91/servo,pyfisch/servo,jimberlage/servo,avadacatavra/servo,mbrubeck/servo,peterjoel/servo,nnethercote/servo,KiChjang/servo,szeged/servo,notriddle/servo,paulrouget/servo,SimonSapin/servo,szeged/servo,paulrouget/servo,fiji-flo/servo,larsbergstrom/servo,SimonSapin/servo,paulrouget/servo,dsandeephegde/servo,pyfisch/servo,rnestler/servo,KiChjang/servo,sadmansk/servo,jimberlage/servo,mbrubeck/servo,larsbergstrom/servo,cbrewster/servo,dsandeephegde/servo,splav/servo,pyfisch/servo,larsbergstrom/servo,ConnorGBrewster/servo,KiChjang/servo,SimonSapin/servo,CJ8664/servo,emilio/servo,KiChjang/servo,KiChjang/servo,avadacatavra/servo,emilio/servo,eddyb/servo,canaltinova/servo,sadmansk/servo,DominoTree/servo,DominoTree/servo,saneyuki/servo,paulrouget/servo,canaltinova/servo,DominoTree/servo,SimonSapin/servo,DominoTree/servo,splav/servo,eddyb/servo,dsandeephegde/servo,thiagopnts/servo,anthgur/servo,nnethercote/servo,rnestler/servo,nnethercote/servo,CJ8664/servo,ConnorGBrewster/servo,mattnenterprise/servo,mbrubeck/servo,mattnenterprise/servo,canaltinova/servo,emilio/servo,anthgur/servo,KiChjang/servo,szeged/servo,canaltinova/servo,jimberlage/servo,upsuper/servo,splav/servo,jimberlage/servo,mbrubeck/servo,emilio/servo,KiChjang/servo,szeged/servo,notriddle/servo,peterjoel/servo,paulrouget/servo,dsandeephegde/servo,peterjoel/servo,paulrouget/servo,fiji-flo/servo,canaltinova/servo,saneyuki/servo,peterjoel/servo,pyfisch/servo,pyfisch/servo,nnethercote/servo,emilio/servo,rnestler/servo,CJ8664/servo,szeged/servo,fiji-flo/servo,nnethercote/servo,upsuper/servo,splav/servo,upsuper/servo,mattnenterprise/servo,avadacatavra/servo,KiChjang/servo,thiagopnts/servo,larsbergstrom/servo,larsbergstrom/servo,CJ8664/servo,peterjoel/servo,pyfisch/servo,nnethercote/servo,DominoTree/servo,dsandeephegde/servo,SimonSapin/servo,eddyb/servo,notriddle/servo,dati91/servo,mbrubeck/servo,splav/servo,anthgur/servo,anthgur/servo,upsuper/servo,szeged/servo,dati91/servo,mattnenterprise/servo,upsuper/servo,DominoTree/servo,fiji-flo/servo,sadmansk/servo,emilio/servo,avadacatavra/servo,pyfisch/servo,szeged/servo,fiji-flo/servo,thiagopnts/servo,fiji-flo/servo,rnestler/servo,larsbergstrom/servo,fiji-flo/servo,peterjoel/servo,ConnorGBrewster/servo,paulrouget/servo,CJ8664/servo,rnestler/servo,saneyuki/servo,larsbergstrom/servo,jimberlage/servo,thiagopnts/servo,saneyuki/servo,sadmansk/servo,notriddle/servo,saneyuki/servo,CJ8664/servo,dati91/servo,eddyb/servo,ConnorGBrewster/servo,CJ8664/servo,mattnenterprise/servo