Clarified roadmap to mention existence of current text/NLP features (#800)

* clarifying roadmap to mention current text/NLP features

* updated the documentation to fix review comments

Author: artidoro

ROADMAP.md

@@ -23,11 +23,12 @@ In the meanwhile, we are looking for contributions.  An easy place to start is t
 	* Native Binary high-performance format
 
 ### Featurization Improvements
+We already provide text/NLP and image processing functionnalities that will be expanded
 * Text  (*)
-  * Natural language text preprocessing such as tokenization, part-of-speech tagging, and sentence breaking
-  * Pre-trained text models that can be used for extracting of semantic or sentiment features from text
+  * Natural language text preprocessing such as improving tokenization features, adding part-of-speech tagging, and sentence boundary disambiguation
+  * Pre-trained text models (beyond current n-gram and pre-trained WordEmbedding text handling) that can further improve the extraction of semantic or sentiment features from text
 * Image  (*)
-  * Image preprocessing such as loading, resizing, and normalization if images
+  * Image preprocessing such as loading, resizing, and normalization of images
   * Image featurization, including industry-standard pre-trained ImageNet neural models, such as ResNet and AlexNet
 
 ### Trained Model Management