Update part3c.md

Corrected the description of why mongoose.connection.close() needs to be used. Unlike what was specified earlier, the program will finish execution even if it is not used, but the connection will remain open until the current node runtime terminates.

Author: sudo-rickroll

src/content/3/en/part3c.md

@@ -246,7 +246,7 @@ note.save().then(result => {
 })
 ```
 
-When the object is saved to the database, the event handler provided to _then_  gets called. The event handler closes the database connection with the command <code>mongoose.connection.close()</code>. If the connection is not closed, the program will never finish its execution.
+When the object is saved to the database, the event handler provided to _then_  gets called. The event handler closes the database connection with the command <code>mongoose.connection.close()</code>. If the connection is not closed, the connection remains open until the program terminates.
 
 The result of the save operation is in the _result_ parameter of the event handler. The result is not that interesting when we're storing one object in the database. You can print the object to the console if you want to take a closer look at it while implementing your application or during debugging.