[Docs] Fix invalid XML comment references

[michael-hawker]

See report: MicrosoftDocs/WindowsCommunityToolkitDocs#275

[mrlacey]

I've started to have a look at these.
Is it possible to rerun the smoke tests (linked) and share the full build report that lists all failures. The report linked from the docs issue is not publicly available.

[mrlacey]

ping

[michael-hawker]

Sorry @mrlacey I think I missed the ping over the holiday. The doc system always incrementally builds. I'll see if I can try and kick off a full build or something to see if I can get more of a complete warnings list.