message: docs: reorder lb docs
  This reorders the lb docs to hopefully make the sequencing make a bit
  more sense. It groups all the locality/priority stuff together, as
  there's quite a lot of interplay between them.
diff: @@ -6,10 +6,10 @@ Load Balancing
  overview
  load_balancers
  - original_dst
  - overprovisioning
  priority
  - zone_aware
  - panic_threshold
  locality_weight
  + overprovisioning
  + panic_threshold
  + original_dst
  + zone_aware
  subsets
  