fix docs modal example fade out
fix docs modal example fade out

the z-index was only corrected for `.modal.show` which made the modal drop behind the header and backdrop when fading out
simply dropping the `.show` from this selector will correct this issue
tagliala/bootstrap,GerHobbelt/bootstrap,janseliger/bootstrap,Hemphill/bootstrap-docs,Lyricalz/bootstrap,9-chirno/chirno,bootstrapbrasil/bootstrap,vsn4ik/bootstrap,Delagen/bootstrap,joblocal/bootstrap,seanwu99/bootstrap,tibo66/bootstrap,kvlsrg/bootstrap,creativewebjp/bootstrap,peterblazejewicz/bootstrap,jipexu/bootstrap,johnajacob/bootstrap,SweetProcess/bootstrap,nice-fungal/bootstrap,inway/bootstrap,bardiharborow/bootstrap,TheFridayInstitute/bootstrap,peterblazejewicz/bootstrap,9-chirno/chirno,janseliger/bootstrap,coliff/bootstrap,coliff/bootstrap,fschumann1211/bootstrap,zalog/bootstrap,zalog/bootstrap,Lyricalz/bootstrap,yuyokk/bootstrap,afuno/bootstrap,tibo66/bootstrap,jipexu/bootstrap,seanwu99/bootstrap,peterblazejewicz/bootstrap,andresgalante/bootstrap,yuyokk/bootstrap,andresgalante/bootstrap,tjkohli/bootstrap,creativewebjp/bootstrap,creativewebjp/bootstrap,twbs/bootstrap,afuno/bootstrap,johnajacob/bootstrap,inway/bootstrap,vsn4ik/bootstrap,inway/bootstrap,jipexu/bootstrap,fschumann1211/bootstrap,Delagen/bootstrap,supergibbs/bootstrap,lipis/bootstrap,lipis/bootstrap,gijsbotje/bootstrap,supergibbs/bootstrap,bardiharborow/bootstrap,gijsbotje/bootstrap,lipis/bootstrap,joblocal/bootstrap,bootstrapbrasil/bootstrap,9-chirno/chirno,Lyricalz/bootstrap,tagliala/bootstrap,stanwmusic/bootstrap,vsn4ik/bootstrap,9-chirno/chirno,TheFridayInstitute/bootstrap,seanwu99/bootstrap,realcrowd/bootstrap,realcrowd/bootstrap,stanwmusic/bootstrap,Hemphill/bootstrap-docs,SweetProcess/bootstrap,afuno/bootstrap,andresgalante/bootstrap,tjkohli/bootstrap,yuyokk/bootstrap,Delagen/bootstrap,supergibbs/bootstrap,bardiharborow/bootstrap,tibo66/bootstrap,TheFridayInstitute/bootstrap,bootstrapbrasil/bootstrap,m5o/bootstrap,gijsbotje/bootstrap,janseliger/bootstrap,twbs/bootstrap,creativewebjp/bootstrap,joblocal/bootstrap,johnajacob/bootstrap,seanwu99/bootstrap,andresgalante/bootstrap,kvlsrg/bootstrap,afuno/bootstrap,johnajacob/bootstrap,stanwmusic/bootstrap,GerHobbelt/bootstrap,joblocal/bootstrap,janseliger/bootstrap,GerHobbelt/bootstrap,nice-fungal/bootstrap,Lyricalz/bootstrap,jipexu/bootstrap,yuyokk/bootstrap,tagliala/bootstrap,m5o/bootstrap,supergibbs/bootstrap,nice-fungal/bootstrap,realcrowd/bootstrap,Delagen/bootstrap,Hemphill/bootstrap-docs,SweetProcess/bootstrap,bardiharborow/bootstrap,zalog/bootstrap,fschumann1211/bootstrap,TheFridayInstitute/bootstrap,kvlsrg/bootstrap,tibo66/bootstrap,SweetProcess/bootstrap,stanwmusic/bootstrap,vsn4ik/bootstrap,lipis/bootstrap,fschumann1211/bootstrap,realcrowd/bootstrap,gijsbotje/bootstrap,Hemphill/bootstrap-docs