Update data-flow-tutorials.md

Author: kromerm

articles/data-factory/data-flow-tutorials.md

@@ -151,3 +151,5 @@ As updates are constantly made to the product, some features have added or diffe
 [Fun with string interpolation and parameters](https://youtu.be/hb3-cn2CMgM)
 
 [Data Flow Script Intro: Copy, Paste, Snippets](https://www.youtube.com/watch?v=3_1I4XdoBKQ)
+
+[Data Quality Expressions](https://www.youtube.com/watch?v=O8gmv5-lXhs)