Add screenshot and link to troubleshooting

Also capitalize the "S" in "Qube Settings". Unfortunately, this is
somewhat inconsistent between the Qube Manager and the Qubes Domains
widget. Hopefully, capitalizing both words makes it clear that this
is also the title of something, rather than the commonplace but
erroneous capitalization of the term "qube" to refer to a VM.
See QubesOS/qubes-issues#4723.

This is a follow-up to #1071.

user/common-tasks/software-update-domu.md

@@ -25,8 +25,11 @@ To permanently install new software in a TemplateVM:
  3. Install software as normally instructed inside that operating system (e.g. using `dnf`, or the dedicated GUI application).
  4. Shut down the TemplateVM.
  5. Restart all [TemplateBasedVMs] based on the TemplateVM.
- 6. (Optional) In the relevant [TemplateBasedVMs]' **Qube settings**, go to the **Applications** tab, select the new application(s) from the list, and press OK.
+ 6. (Optional) In the relevant [TemplateBasedVMs]' **Qube Settings**, go to the **Applications** tab, select the new application(s) from the list, and press OK.
     These new shortcuts will appear in the Applications Menu.
+    (If you encounter problems, see [here][shortcuts] for troubleshooting.)
+
+![[The Applications tab in Qube Settings](/attachment/wiki/ManagingAppVmShortcuts/r4.1-dom0-appmenu-select.png)](/attachment/wiki/ManagingAppVmShortcuts/r4.1-dom0-appmenu-select.png)
 
 
 ## Updating software in TemplateVMs
@@ -321,4 +324,5 @@ Note that the app will autostart only when the AppVM starts. If you would like t
 [service framework]: /doc/qubes-service/
 [How to Reinstall a TemplateVM]: /doc/reinstall-template/
 [installing contributed packages]: /doc/installing-contributed-packages/
+[shortcuts]: /doc/managing-appvm-shortcuts/