Update mongodb.md (nextauthjs#673)

Fix typo: MonogDB => MongoDB

Co-authored-by: Lori Karikari <[email protected]>

Author: wedneyyuri

www/docs/schemas/mongodb.md

@@ -7,7 +7,7 @@ MongoDB is a document database and does not use schemas in the same way as most
 
 **In MongoDB as collections and indexes are created automatically.**
 
-## Objects in MonogDB
+## Objects in MongoDB
 
 Objects stored in MongoDB use similar datatypes to SQL, with some differences: