DOCS-7241: adds get_id and delete_id to mongofiles ref

source/reference/program/mongofiles.txt

@@ -162,14 +162,34 @@ Commands
    system.
 
    Here, ``<filename>`` refers to the name the object will have in
-   GridFS, and :program:`mongofiles` assumes that this reflects the name the
-   file has on the local file system. If the local filename is
-   different use the :option:`mongofiles --local` option.
+   GridFS. :program:`mongofiles` writes the file to the local
+   file system using the file's ``filename`` in GridFS. To choose a
+   different location for the file on the local file system, use the
+   :option:`--local` option.
+
+.. describe:: get_id "<ObjectId>"
+
+   .. versionadded:: 3.2.0
+
+   Copy the specified file from GridFS storage to the local file system.
+
+   Here ``<ObjectId>`` refers to the extended JSON ``_id`` of the
+   object in GridFS. :program:`mongofiles` writes the file to the local
+   file system using the file's ``filename`` in GridFS. To choose a
+   different location for the file on the local file system, use the
+   :option:`--local` option.
 
 .. describe:: delete <filename>
 
    Delete the specified file from GridFS storage.
 
+.. describe:: delete_id "<ObjectId>"
+
+   .. versionadded:: 3.2.0
+
+   Delete the specified file from GridFS storage. Specify the file using
+   its ``_id``.
+
 Examples
 --------
 
@@ -229,3 +249,13 @@ database named ``32-corinth.lp``, you can use the following command:
 .. code-block:: sh
 
    mongofiles -d records get 32-corinth.lp
+
+To fetch the file from the GridFS collection in the ``records`` database
+with ``_id: ObjectId("56feac751f417d0357e7140f")``, you can use
+the following command:
+
+.. code-block:: sh
+
+   mongofiles -d records get_id 'ObjectId("56feac751f417d0357e7140f")'
+
+You must include quotation marks around the ``_id``.