Fix typo: `fom` -> `from` (#142)

Signed-off-by: Yz4230 <yuzupon1480@gmail.com>

nginx-flask-mongo/README.md

@@ -62,7 +62,7 @@ d7eea5481c77        mongo                       "docker-entrypoint.s…"   About
 After the application starts, navigate to `http://localhost:80` in your web browser or run:
 ```
 $ curl localhost:80
-Hello fom the MongoDB client!
+Hello from the MongoDB client!
 ```
 
 Stop and remove the containers