Fix title to Robo 3T

Author: Sandeep Nair

articles/cosmos-db/mongodb/TOC.yml

@@ -336,7 +336,7 @@
                   href: connect-using-mongochef.md
                 - name: Connect using Compass
                   href: connect-using-compass.md
-                - name: Connect using Studio 3T
+                - name: Connect using Robo 3T
                   href: connect-using-robomongo.md
                 - name: Connect using Mongoose
                   href: connect-using-mongoose.md