docs: trivial change
docs: trivial change

s/storage.DefaultHeartbeatInteval/base.DefaultHeartbeatInterval/g

Fixes #7179.

glycerine/cockroach,paperstreet/cockroach,cockroachdb/cockroach,sunya123/cockroach,glycerine/cockroach,cockroachdb/cockroach,arjun4084346/cockroach,petermattis/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,sunya123/cockroach,vaibhavarora/cockroach,sunya123/cockroach,maxlang/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,arjun4084346/cockroach,maxlang/cockroach,cockroachdb/cockroach,sunya123/cockroach,petermattis/cockroach,maxlang/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,sunya123/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,glycerine/cockroach,petermattis/cockroach,glycerine/cockroach,veteranlu/cockroach,petermattis/cockroach,vivekmenezes/cockroach,maxlang/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,sunya123/cockroach,glycerine/cockroach,petermattis/cockroach,veteranlu/cockroach,paperstreet/cockroach,cockroachdb/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,veteranlu/cockroach,cockroachdb/cockroach,sunya123/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,sunya123/cockroach,maxlang/cockroach,maxlang/cockroach,paperstreet/cockroach,maxlang/cockroach,petermattis/cockroach,glycerine/cockroach,arjun4084346/cockroach,glycerine/cockroach,veteranlu/cockroach,veteranlu/cockroach,petermattis/cockroach,vivekmenezes/cockroach,maxlang/cockroach,cockroachdb/cockroach,glycerine/cockroach,petermattis/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,arjun4084346/cockroach