DOCSP-23090 link to download center (#219)

Author: Dave Cuthbert

source/index.txt

@@ -22,7 +22,8 @@ deployments. You can use the |mdb-shell| to test queries and operations
 directly with your database.
 
 :binary:`~bin.mongosh` is available as a standalone package in the
-MongoDB download center.
+`MongoDB Download Center
+<https://www.mongodb.com/try/download/shell?jmp=docs>`__.
 
 Download and Install ``mongosh``
 --------------------------------