The reputation level for "create tag synonyms" of 2500 is missing on the FAQ page on StackOverflow. I do not see any edit button where I can edit or suggest an edit for this page, which I guess is kind of logical. It is available here: http://stackoverflow.com/privileges
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Yes, this is intentional...only the fairly major milestones are covered in the FAQ list, to keep it readable. The same applies not only to reputation section but the FAQ in general, it's not an exhaustive list of all things.
See it from this view...look at meta then consider how long the FAQ would be if it was all-encompassing :)