The "one" case should always include %d. Say so, and fix our examples.
Also make it clear that developers should always provide exactly "one"
and "other".
Bug: 18429565
(cherry picked from commit 1fe7d496db1ddc73289e6aae11f4dd4a970141d5)
Change-Id: I89656c74b7dfd91584e1bb6d0a3f2da1dda81079