Clicking on a tag that has no tag wiki shows the following message atop all questions (except the tag name might differ, obviously):
However, clicking on it greets one with
Tag wikis can be edited by users with more than 2000 reputation, provided:
- They are in the top 20 answerers for this tag or
- They have a total score of 100 or more for this tag
I'm quite obviously not in that category for a tag that has a mere three questions, but anyway: Providing the link to create the tag wiki is only helpful in the first place if the user is actually allowed to create anything.