Merge pull request #3181 from reubenmiller/docs-add-suffix

docs: add notes to firmware on-boarding instructions

docs/src/extend/firmware-management/device-onboarding.md

@@ -71,6 +71,15 @@ On your machine (not the target device that will be on-boarded) you will need on
  c8y extension install thin-edge/c8y-tedge
  ```
 
+ :::tip
+
+ If you have already installed the `c8y-tedge` go-c8y-cli extension, then make sure it is up-to-date using:
+
+ ```sh
+ c8y extension update tedge
+ ```
+ :::
+
 3. Create a Cumulocity session file (if one does not already for the Cumulocity instance you wish to connect to)
 
  ```sh
@@ -94,13 +103,13 @@ On your machine (not the target device that will be on-boarded) you will need on
  ```
 
  ```sh title="Output"
- rpi1-b827eb21100e
- rpi2-b827ebed6e5a
- rpi3-b827ebe1f7d6
- rpi4-dcb630486720
- rpi5-d83add9a145a
- rpizero-b827ebdddb46
- rpizero2-d83add030bfd
+ rpi1-b827eb21100e.local
+ rpi2-b827ebed6e5a.local
+ rpi3-b827ebe1f7d6.local
+ rpi4-dcb630486720.local
+ rpi5-d83add9a145a.local
+ rpizero-b827ebdddb46.local
+ rpizero2-d83add030bfd.local
  ```
 
  :::info