Fix docs - remove unused module

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

docs/index.rst

@@ -89,7 +89,6 @@ Supported Machine Learning Libraries
    modules/estimators/regression
    modules/estimators/regression_scikitlearn
    modules/estimators/speech_recognition
-   modules/experimental
    modules/experimental/estimators
    modules/experimental/estimators/classification
    modules/evaluations