I want to note that the core XenForo function does not seem to work in a way that makes sense in terms of encouraging content discovery.
A general search for the term 'pegasus' will show all results from every content-type in the search results. Since it also matches a user-name, it triggers the sidebar block 'Matched Users'. However, there are no 'User' content-type results in the main results list, and it is not possible to simply 'Search Users' from the 'More...' search function. Since wiki pages already appear in the search results, having them appear in the sidebar in this view would be redundant.
This function would be much more useful for when you are only searching a specific content-type, and there are results from a different type. However, XenForo does not trigger 'Matched Users' if you specifically 'Search Threads' for the term 'pegasus'. I suppose the idea is that you knew you wanted threads, so why waste the resources.
While I do like this idea, since it will give the wiki more exposure, I have to wonder why XenForo didn't implement similar functions for other content-types. e.g. on XenForo's site, searching for 'vaultwiki' in profile posts does not return a 'Matched Resources' block containing the VaultWiki resource.