Update INTRO.md

Author: tango4j

INTRO.md

@@ -9,7 +9,7 @@ This repository aims for comparative analysis of TensorFlow vs PyTorch, for thos
 
 **TensorFlow**  
 
-[Eager Excution(Oct 17, 2018)](https://www.tensorflow.org/guide/eager)   
+[Eager Excution (Oct 17, 2018)](https://www.tensorflow.org/guide/eager)   
 Tensorflow also launches a dynamic graph framework which enables define by run.
 
 **Pytorch**