Remove objects defined in Nulls from docs

nalimilan · nalimilan · commit 67f9acac4ef5 · 2017-10-05T22:16:09.000+02:00
diff --git a/docs/src/da.md b/docs/src/da.md
@@ -1,14 +1,7 @@
-# Representing missing data
-
 ```@meta
 CurrentModule = DataArrays
 ```
 
-```@docs
-null
-Null
-```
-
 ## Arrays with possibly missing data
 
 ```@docs
@@ -19,10 +12,6 @@ DataArray
 DataVector
 DataMatrix
 @data
-isnull
-Nulls.fail
-Nulls.skip
-Nulls.replace
 padnull
 levels
 ```
