[DOCS] Fixes transform links (elastic#552)

Author: lcawl

docs/en/stack/ml/df-analytics/index.asciidoc

@@ -13,9 +13,8 @@ annotated data. You can slice and dice the data extended with the results as you
 normally do with any other data set.
 
 IMPORTANT: Using {dfanalytics} requires source data to be structured as a two 
-dimensional "tabular" data structure, in other words a 
-{stack-ov}/ml-dataframes.html[{dataframe}]. 
-{ref}/transform-apis.html[{transforms-cap}] allow you to create 
+dimensional "tabular" data structure, in other words a {dataframe}. 
+{ref}/transforms.html[{transforms-cap}] enable you to create 
 {dataframes} which can be used as the source for {dfanalytics}.
 
 * <<dfa-outlier-detection>>