Add documenting of configuration conventions to TODO

Change-Id: I98264d8a016643535cc61b1aa757402c008ec08d
Reviewed-on: https://gerrit.stanford.edu/1326
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>
Add SRV records to TODO

Change-Id: If20633de8762c8e7aee76335c9432a5636436006
Reviewed-on: https://gerrit.stanford.edu/1327
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>