Fixed typo in listItems documentation.

Duplicate `img.landscape-4x3.src` fixed.

Author: Alex Bea

docs/data-listitems.md

@@ -94,7 +94,7 @@ The list text attributes were built using several lorem ipsum generators. The im
     img.rectangle.src      (4x3 aspect ratio)
     img.rectangle.alt
     img.landscape-4x3.src
-    img.landscape-4x3.src
+    img.landscape-4x3.alt
     img.landscape-16x9.src
     img.landscape-16x9.alt
     name.first             (e.g. Junius)
@@ -121,4 +121,4 @@ The list text attributes were built using several lorem ipsum generators. The im
     minute.short           (e.g. 9)
     seconds                (e.g. 52)
 
-The aspect ratio for `img.rectangle` is 4x3. Hopefully this gives pattern developers an easy way to build out dynamic lists for testing.
+The aspect ratio for `img.rectangle` is 4x3. Hopefully this gives pattern developers an easy way to build out dynamic lists for testing.