"--single-window" suggestion for troubleshooting page

**Your Godot version:**
4.0.2

**Issue description:**
I can't write wiki-worth text and the article is said to be outdated, not yet ready. So just sharing a tip for people with older OpenGL driver as an issue instead of pull request.

I had problem where Project Manager opening window looked fine, but opening "create new project" or "import project" dialog showed corrupted graphic and then blank. Same for dropdown menus while editing project. This was fixed by running Godot 4 with "--single-window" command option. I find that it's worth mention because new people wouldn't think of trying such command option and because even I wasn't aware that broken dialog was because now in Godot Editor each dialog is a separate window from the main one.

I also saw at least one more person somewhere I forgot month ago having same problem.

As a bonus, ought to mention "--rendering-driver opengl3" nearby, great for launching project that were imported in Vulkan mode, And tell people to upgrade their OpenGL driver, if they are able.

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/about/troubleshooting.html