Merge pull request #1645 from segmentio/DOC-203_remove-traits

DOC-203 remove unavailable traits

Author: markzegarelli

src/personas/computed-traits.md

@@ -143,10 +143,6 @@ The following operators are available.
 - not exists
 - before date
 - after date
-- within last (x days)
-- with next (x days)
-- before last (x days)
-- after next (x days)
 
 ## Connecting your Computed Trait to a Destination