wifi_station_scan example and doc

[doswork]

When I'm migrating from SDK 1.3 to 1.5, wifi_station_scan seems to lose something.
Then I found the post Migrating applications from SDK 1.3 to SDK 1.4,http://bbs.espressif.com/viewtopic.php?f=7&t=1173. tve said: prior the SDK 1.4 the scan results had a bogus 0-th entry, this got fixed in SDK 1.4.
But there is no description of the change in release note. The example code in programming_guide_v1.5.1 and viewtopic.php?f=21&t=229 still ignore the first entry.
Please update the document and example code.