doc: add description of description setting and update ChangeLog

Signed-off-by: Joachim Wiberg <[email protected]>

doc/ChangeLog.md

@@ -16,6 +16,11 @@ All notable changes to the project are documented in this file.
 [v24.10.1][] - 2024-10-18
 -------------------------
 
+### Changes
+ - Add support for interface description, sometimes referred to as
+   "ifAlias".  Saved as an Linux interface alias (not `altname`), e.g.,
+   `/sys/class/interfaces/veth0a/ifalias`, includes operational support
+
 ### Fixes
  - Fix #735: `copy` and `erase` commands missing from CLI, regression
    in Infix v24.10.0 defconfigs, now added as dep. in klish package

doc/networking.md

@@ -97,6 +97,10 @@ This is an extension to the ietf-interfaces YANG model, which defines
 `phys-address` as read-only[^4].  The following shows the different
 configuration options.
 
+The `description` is saved as Linux `ifalias` on an interface.  It is a
+free-form string, useful for describing purpose or just adding comments
+for remote debugging, e.g., using the operational datastore.
+
 > **Note:** there is no validation or safety checks performed by the
 > system when using `custom-phys-address`.  In particular the `offset`
 > variant can be dangerous to use -- pay attention to the meaning of