Updated file name and alttext

Author: Sandeep Nair

articles/cosmos-db/mongodb/vcore/TOC.yml

@@ -41,7 +41,7 @@
         - name: Migration options
           href: migration-options.md
         - name: Migrate using MongoDB tools
-          href: migrate-with-mongotools.md
+          href: migrate-with-mongo-tools.md
     - name: Troubleshooting and performance
       items:
         - name: Troubleshoot common issues

articles/cosmos-db/mongodb/vcore/migrate-with-mongotools.md renamed to articles/cosmos-db/mongodb/vcore/migrate-with-mongo-tools.md

@@ -38,7 +38,7 @@ To complete this tutorial, you need to:
 
 ## Choose the proper MongoDB native tool
 
-![Diagram of selecting the best MongoDB native tool.](./media/tutorial-mongotools-cosmos-db/mongodb-native-tool-selection-table.png)
+![Table for selecting the best MongoDB native tool.](./media/tutorial-mongotools-cosmos-db/mongodb-native-tool-selection-table.png)
 
 * *mongoexport/mongoimport* is the best pair of migration tools for migrating a subset of your MongoDB database.
     * *mongoexport* exports your existing data to a human-readable JSON or CSV file. *mongoexport* takes an argument specifying the subset of your existing data to export.