change to description of cloneCollection command

Author: Bob Grabar

source/reference/commands.txt

@@ -1048,9 +1048,9 @@ Collections
 
    .. code-block:: javascript
 
-      { cloneCollection: "app.users", from: "db.example.net:27017", query: { active: true }, copyIndexes: false }
+      { cloneCollection: "users", from: "db.example.net:27017", query: { active: true }, copyIndexes: false }
 
-   This operation copies the "users" collection from the "app"
+   This operation copies the "users" collection from the current
    database on the server at ``db.example.net``. The operation only
    copies documents that satisfy the query ``{ active: true }`` and
    does not copy indexes. :dbcommand:`cloneCollection` copies indexes