sudo apt update vs sudo apt upgrade to update packages in Ubuntu/WSL

Nobody has claimed this yet.

**Is your feature request related to a problem? Please describe.**
I am extremely new to everything computer, so maybe it's not a thing, and it's not exactly a problem. When I was updating my ubuntu package I just had to run:

sudo apt update

Then also

sudo apt upgrade

The first seemed to download the updates, and the second actively installed them? Only the first one was mentioned in the instructions at:
https://learn.microsoft.com/en-us/windows/wsl/tutorials/gui-apps

**Describe the solution you'd like**
Either add a step for upgrading or (if someone has a couple minutes to reply) tell me why what I did was unnecessary or harmful.

**Describe alternatives you've considered**
I have considered that I'm new to all this and maybe implementing a googled solution before asking here was a mistake, but it appeared to work so *weeeeeeee*

**Additional context**
You guys do wonderful work here and without it I'd be lost.

Review the Ubuntu/WSL GUI apps tutorial linked in the issue and compare its `sudo apt update` step with the reported `sudo apt upgrade` behavior. Confirm the intended package-update guidance, then update the tutorial or clarify why the existing command is sufficient; done when the instructions resolve this question.

Written by the indexing model from the issue text.