Mention data in custom fields, link Jinja2 docs.

Resolves #7367

Author: HumanEquivalentUnit

docs/models/extras/customlink.md

@@ -1,8 +1,8 @@
 # Custom Links
 
-Custom links allow users to display arbitrary hyperlinks to external content within NetBox object views. These are helpful for cross-referencing related records in systems outside NetBox. For example, you might create a custom link on the device view which links to the current device in a network monitoring system.
+Custom links allow users to display arbitrary hyperlinks to external content within NetBox object views. These are helpful for cross-referencing related records in systems outside NetBox. For example, you might create a custom link on the device view which links to the current device in a Network Monitoring System (NMS).
 
-Custom links are created by navigating to Customization > Custom Links. Each link is associated with a particular NetBox object type (site, device, prefix, etc.) and will be displayed on relevant views. Each link is assigned text and a URL, both of which support Jinja2 templating. The text and URL are rendered with the context variable `obj` representing the current object.
+Custom links are created by navigating to Customization > Custom Links. Each link is associated with a particular NetBox object type (site, device, prefix, etc.) and will be displayed on relevant views. Each link has display text and a URL, and data from the Netbox item being viewed can be included in the link using [Jinja2 template code](https://jinja2docs.readthedocs.io/en/stable/) through the variable `obj`, and custom fields through `obj.cf`.
 
 For example, you might define a link like this: