(DOCSP-20843): config reset (#189)

* (DOCSP-20843): config reset

* fix broken link

* tense

* remove extra word

* remove extra word

* changelog wording

* updates per copy review

* standardize step phrasing

Author: jeff-allen-mongo

source/changelog.txt

@@ -20,8 +20,9 @@ v1.2.1
 - :issue:`MONGOSH-1063` - You can now create a global ``monogosh``
   :ref:`configuration file <mongosh-shell-settings>`.
 
-- :issue:`MONGOSH-959` – You can now use the ``config.reset`` method to
-  return to the default configuration settings.
+- :issue:`MONGOSH-959` – You can now use the :ref:`config.reset
+  <example-reset-setting>` method to reset a configuration setting to
+  the default value.
 
 - :issue:`MONGOSH-1133` – ``mongosh`` adds a :option:`--tlsUseSystemCA`
   option that causes ``mongosh`` to attempt to load system

source/reference/configure-shell-settings.txt

@@ -46,6 +46,12 @@ Change the current setting of ``<property>`` to ``<value>``:
 
    config.set( "<property>", <value> )
 
+Reset a ``<property>`` to the default value:
+
+.. code-block:: javascript
+
+   config.reset( "<property>" )
+
 Supported ``property`` parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -324,3 +330,34 @@ changes. (Note that this stores the most recent input first.)
    db.contacts.find( {"email": "<email>" } )
    config.set( "redactHistory", "remove-redact" )
 
+.. _example-reset-setting:
+
+Reset a Configuration Setting to the Default Value
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you modified a configuration setting and want to reset it to the
+default value, use ``config.reset( "<property>" )``.
+
+#. Change the value of the ``historyLength`` setting to ``2000``:
+
+   .. code-block:: javascript
+
+      config.set("historyLength", 2000)
+
+#. Verify the updated value for ``historyLength``:
+
+   .. code-block:: javascript
+
+      config.get("historyLength")
+
+#. Reset the ``historyLength`` setting to the default value of ``1000``:
+
+   .. code-block:: javascript
+
+      config.reset("historyLength")
+
+#. Verify the updated value for ``historyLength``:
+
+   .. code-block:: javascript
+
+      config.get("historyLength")