DOC: rewrite `bracket` description and +SKIP non-deterministic examples
DOC: rewrite `bracket` description and +SKIP non-deterministic examples

pllim/astropy,saimn/astropy,mhvk/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,pllim/astropy,aleksandr-bakanov/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,saimn/astropy,aleksandr-bakanov/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,lpsinger/astropy,mhvk/astropy,larrybradley/astropy,larrybradley/astropy,StuartLittlefair/astropy,lpsinger/astropy,lpsinger/astropy,astropy/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,mhvk/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,larrybradley/astropy,lpsinger/astropy,larrybradley/astropy,pllim/astropy,astropy/astropy,aleksandr-bakanov/astropy