Update cheatsheets

mongo

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mongo
+
+> The legacy MongoDB shell. See `mongosh` for the new shell.
+> Note: all connection options can be replaced with one string: `mongodb://user@host:port/db_name?authSource=authdb_name`.
+> More information: <https://docs.mongodb.com/manual/reference/program/mongo>.
+
+- Connect to a local database on the default port (`mongodb://localhost:27017`):
+
+`mongo`
+
+- Connect to a database:
+
+`mongo --host {{host}} --port {{port}} {{db_name}}`
+
+- Authenticate using the specified username on the specified database (you will be prompted for a password):
+
+`mongo --host {{host}} --port {{port}} --username {{username}} --authenticationDatabase {{authdb_name}} {{db_name}}`
+
+- Evaluate a JavaScript expression on a database:
+
+`mongo --eval '{{JSON.stringify(db.foo.findOne())}}' {{db_name}}`