Add the Custom Cookie guide to the nav-list

[70825]

Expected Behavior

I think users reading the documentation should be able to find the Custom Cookie entry in the nav.

Current Behavior

Currently, the Custom Cookie entry can be found via search and this page in the samples and guide.

Context

I noticed that while the 'Custom Cookies' sample page is available, it wasn't listed in the navigation.
I happened to discover the 'Custom Cookies' page through a search.
Would it be possible to also include it in the navigation for easier access?