No longer say that ATOMIC_REBUILD is "Experimental" (#2964)
No longer say that ATOMIC_REBUILD is "Experimental" (#2964)

We've used this in production on a few sites for over a year now and haven't hit any problems.
chrxr/wagtail,mixxorz/wagtail,iansprice/wagtail,mikedingjan/wagtail,nilnvoid/wagtail,nealtodd/wagtail,Toshakins/wagtail,zerolab/wagtail,wagtail/wagtail,nimasmi/wagtail,iansprice/wagtail,zerolab/wagtail,nilnvoid/wagtail,mixxorz/wagtail,nutztherookie/wagtail,Toshakins/wagtail,kaedroho/wagtail,wagtail/wagtail,iansprice/wagtail,thenewguy/wagtail,kaedroho/wagtail,nealtodd/wagtail,rsalmaso/wagtail,jnns/wagtail,timorieber/wagtail,zerolab/wagtail,thenewguy/wagtail,thenewguy/wagtail,zerolab/wagtail,timorieber/wagtail,torchbox/wagtail,gasman/wagtail,FlipperPA/wagtail,nutztherookie/wagtail,nealtodd/wagtail,kaedroho/wagtail,jnns/wagtail,thenewguy/wagtail,gasman/wagtail,gasman/wagtail,FlipperPA/wagtail,iansprice/wagtail,FlipperPA/wagtail,chrxr/wagtail,nimasmi/wagtail,nilnvoid/wagtail,mixxorz/wagtail,chrxr/wagtail,mikedingjan/wagtail,nutztherookie/wagtail,Toshakins/wagtail,chrxr/wagtail,jnns/wagtail,rsalmaso/wagtail,takeflight/wagtail,wagtail/wagtail,nutztherookie/wagtail,nimasmi/wagtail,kaedroho/wagtail,jnns/wagtail,mixxorz/wagtail,rsalmaso/wagtail,torchbox/wagtail,mixxorz/wagtail,takeflight/wagtail,Toshakins/wagtail,zerolab/wagtail,gasman/wagtail,nimasmi/wagtail,rsalmaso/wagtail,takeflight/wagtail,gasman/wagtail,mikedingjan/wagtail,rsalmaso/wagtail,nealtodd/wagtail,thenewguy/wagtail,timorieber/wagtail,timorieber/wagtail,FlipperPA/wagtail,kaedroho/wagtail,wagtail/wagtail,mikedingjan/wagtail,torchbox/wagtail,wagtail/wagtail,torchbox/wagtail,takeflight/wagtail,nilnvoid/wagtail