fix to anchor in insert pg

Author: rustagir

source/fundamentals/crud/write-operations/insert.txt

@@ -32,7 +32,7 @@ to insert them. You can insert documents by using the following methods:
 
 This guide includes the following sections:
 
-- :ref:`The _id Field <rust-retrieve-find>` describes the ``_id`` field
+- :ref:`The _id Field <rust-id-field>` describes the ``_id`` field
   that each document contains
 
 - :ref:`Insert a Document <rust-insert-one>` describes how to use the
@@ -345,4 +345,4 @@ guide, see the following API documentation:
 - `InsertManyResult <{+api+}/results/struct.InsertManyResult.html>`__
 - `InsertManyOptions <{+api+}/options/struct.InsertManyOptions.html>`__
 - `BulkWriteError <{+api+}/error/struct.BulkWriteError.html>`__
-- `BulkWriteFailure <{+api+}/error/struct.BulkWriteFailure.html>`__
+- `BulkWriteFailure <{+api+}/error/struct.BulkWriteFailure.html>`__