Currently we do not have docs for our storage integration on their official website but we do have them in our readme.

Example for libsql https://mastra.ai/en/examples/memory/memory-with-libsql

Looks like we have to add it here: https://github.com/mastra-ai/mastra/tree/main/docs/src/content/en/reference/storage

Secondly, please look through the site to see if there are other places we'd like MongoDB to surface up.