hhvm/hack-hhvm-docs — pull request #250 by Nyholm (2014-06-10 09:38:42+00:00)
Title: Change O(lg n) with lower-case n

When using big O-notation you should use lower-case n. The lower-case n was used on [Map](http://docs.hhvm.com/manual/en/hack.collections.map.php) but not on [Set](http://docs.hhvm.com/manual/en/hack.collections.set.php).