Fix typo in introduction.md (#266)

Author: natema

docs/introduction.md

@@ -1,6 +1,6 @@
 # Introduction
 
-*This tutorial explains the qickstart examples and some core abstractions FastAI.jl is built on.*
+*This tutorial explains the quickstart examples and some core abstractions FastAI.jl is built on.*
 
 {cell=main show=false outputshow=false resultshow=false}
 ```julia
@@ -115,4 +115,4 @@ Training now is quite simple. You have several options for high-level training s
 showoutputs(task, learner)
 ```
 
-Finally, the last line visualizes the predictions of the trained model. It takes some samples from the training data loader, runs them through the model and decodes the outputs. How each piece of data is visualized is also inferred through the blocks in the learning task.
+Finally, the last line visualizes the predictions of the trained model. It takes some samples from the training data loader, runs them through the model and decodes the outputs. How each piece of data is visualized is also inferred through the blocks in the learning task.