Document the .bg-faded class
Document the .bg-faded class

Fixes #20550.

Delagen/bootstrap,bootstrapbrasil/bootstrap,tibo66/bootstrap,sealocal/bootstrap,hebbet/bootstrap,tomlutzenberger/bootstrap,afuno/bootstrap,davethegr8/bootstrap,inway/bootstrap,Scoutski/bootstrap,tjkohli/bootstrap,abvalentine/bootstrap,gijsbotje/bootstrap,n054/bootstrap,copperdesign/bootstrap,Hemphill/bootstrap-docs,JumpLinkNetwork/bootstrap-backward,m5o/bootstrap,johnajacob/bootstrap,hebbet/bootstrap,IdanCo/bootstrap,copperdesign/bootstrap,NCARB/bootstrap,Lyricalz/bootstrap,lipis/bootstrap,supergibbs/bootstrap,seanwu99/bootstrap,bootstrapbrasil/bootstrap,nice-fungal/bootstrap,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,fschumann1211/bootstrap,realcrowd/bootstrap,Delagen/bootstrap,janseliger/bootstrap,Lyricalz/bootstrap,realcrowd/bootstrap,GerHobbelt/bootstrap,slavanga/bootstrap,n054/bootstrap,yuyokk/bootstrap,afuno/bootstrap,realcrowd/bootstrap,seanwu99/bootstrap,lemuelbarango/bootstrap,igoynawamreh/bootstrap,supergibbs/bootstrap,gijsbotje/bootstrap,JumpLinkNetwork/bootstrap-backward,afuno/bootstrap,igoynawamreh/bootstrap,xt0rted/bootstrap,lipis/bootstrap,edanbarak/bootstrap,bardiharborow/bootstrap,tagliala/bootstrap,slavanga/bootstrap,twbs/bootstrap,twbs/bootstrap,9-chirno/chirno,jipexu/bootstrap,jipexu/bootstrap,tomlutzenberger/bootstrap,GerHobbelt/bootstrap,IdanCo/bootstrap,tibo66/bootstrap,creativewebjp/bootstrap,GerHobbelt/bootstrap,copperdesign/bootstrap,hebbet/bootstrap,bardiharborow/bootstrap,nice-fungal/bootstrap,tibo66/bootstrap,joblocal/bootstrap,igoynawamreh/bootstrap,peterblazejewicz/bootstrap,IdanCo/bootstrap,andresgalante/bootstrap,andresgalante/bootstrap,janseliger/bootstrap,Hemphill/bootstrap-docs,sealocal/bootstrap,TheFridayInstitute/bootstrap,stanwmusic/bootstrap,SweetProcess/bootstrap,bardiharborow/bootstrap,yuyokk/bootstrap,JumpLinkNetwork/bootstrap-backward,lemuelbarango/bootstrap,9-chirno/chirno,zalog/bootstrap,NCARB/bootstrap,sealocal/bootstrap,9-chirno/chirno,inway/bootstrap,kvlsrg/bootstrap,abvalentine/bootstrap,supergibbs/bootstrap,seanwu99/bootstrap,n054/bootstrap,n054/bootstrap,sealocal/bootstrap,xt0rted/bootstrap,copperdesign/bootstrap,NCARB/bootstrap,tibo66/bootstrap,andresgalante/bootstrap,TheFridayInstitute/bootstrap,xt0rted/bootstrap,tomlutzenberger/bootstrap,jipexu/bootstrap,TheFridayInstitute/bootstrap,fschumann1211/bootstrap,lipis/bootstrap,lipis/bootstrap,IdanCo/bootstrap,tagliala/bootstrap,davethegr8/bootstrap,seanwu99/bootstrap,coliff/bootstrap,yuyokk/bootstrap,joblocal/bootstrap,vsn4ik/bootstrap,tjkohli/bootstrap,tagliala/bootstrap,vsn4ik/bootstrap,hebbet/bootstrap,xt0rted/bootstrap,inway/bootstrap,NCARB/bootstrap,supergibbs/bootstrap,janseliger/bootstrap,9-chirno/chirno,andresgalante/bootstrap,zalog/bootstrap,slavanga/bootstrap,afuno/bootstrap,edanbarak/bootstrap,Delagen/bootstrap,Delagen/bootstrap,lemuelbarango/bootstrap,vsn4ik/bootstrap,SweetProcess/bootstrap,slavanga/bootstrap,nice-fungal/bootstrap,abvalentine/bootstrap,gijsbotje/bootstrap,edanbarak/bootstrap,fschumann1211/bootstrap,Scoutski/bootstrap,johnajacob/bootstrap,m5o/bootstrap,stanwmusic/bootstrap,lemuelbarango/bootstrap,johnajacob/bootstrap,Scoutski/bootstrap,kvlsrg/bootstrap,coliff/bootstrap,janseliger/bootstrap,joblocal/bootstrap,creativewebjp/bootstrap,Lyricalz/bootstrap,davethegr8/bootstrap,Scoutski/bootstrap,johnajacob/bootstrap,zalog/bootstrap,stanwmusic/bootstrap,gijsbotje/bootstrap,stanwmusic/bootstrap,abvalentine/bootstrap,Hemphill/bootstrap-docs,JumpLinkNetwork/bootstrap-backward,creativewebjp/bootstrap,creativewebjp/bootstrap,TheFridayInstitute/bootstrap,davethegr8/bootstrap,Lyricalz/bootstrap,SweetProcess/bootstrap,peterblazejewicz/bootstrap,igoynawamreh/bootstrap,kvlsrg/bootstrap,peterblazejewicz/bootstrap,joblocal/bootstrap,bardiharborow/bootstrap,Hemphill/bootstrap-docs,jipexu/bootstrap,fschumann1211/bootstrap,realcrowd/bootstrap,edanbarak/bootstrap,SweetProcess/bootstrap,yuyokk/bootstrap