📝 Update docs, typos, aclarations, fix examples

for NoSQL models

docs/tutorial/intro.md

@@ -2,9 +2,9 @@ This tutorial shows you how to use **FastAPI** with all its features, step by st
 
 Eeach section gradually builds on the previous ones, but it's structured to separate topics, so that you can go directly to any specific one to solve your specific API needs.
 
-It is also built to work as a future reference. So you can come back and see exactly what you need.
+It is also built to work as a future reference.
 
-And each section is very short, so you can go directly to what you need and get the information fast.
+So you can come back and see exactly what you need.
 
 ## Run the code