The expectations seem to have moved to RimWorld/Data/Core/Defs/Misc/ExpectationDefs/Expectations.xml . I tried updating the wiki, but in the preview, it didn't render the file. I don't know the mechanics of the file-rendering.
The section "Situation General" still contains a comment about it, indicating that the expectations might have previously been there. I think it would be nice to have a separate article on expecations, though, since it is quite a central concept.
I'm not entirely sure what you're trying to say wrt file rendering, but I the issue you're having might be that the thoughts tables are transcluded from their own pages rather than being on the page itself. So Situation General is actually at Thoughts/Situation_General and then its transcluded to that section of the Mood page.
As for the main issue, if you'd like you can add a section for expectations (just make it on this page and we xan make any standardization changes, if any, later), and create a redirect to it at Expectations but personally I don't know that it needs an entire page to itself so long as the relevant details (e.g. wealth levels) are included here. Its still ultimately a mood mechanic after all. Thats just my opinion though, not any official ruling. Open to arguments for it.