comment rather than doc

src/DataAPI.jl

@@ -522,15 +522,8 @@ Return the row number of `row` in the source table.
 """
 function rownumber end
 
-"""
-    groupby(obj, args...; kw...)
-
-Group `obj` into partitions specified by `args` and `kw`,
-which may vary according to the implementation for `obj`.
-
-To avoid type piracy and method ambiguities, implementations of `groupby` 
-must restrict the first argument to a type defined in the same package. 
-"""
+# To avoid type piracy and method ambiguities, implementations of `groupby` 
+# must restrict the first argument to a type defined in the same package. 
 function groupby end
 
 end # module