explain xkcd: It's 'cause you're dumb.
Use this template to link to diffs.
Examples of usage:
{{diff|123}} → [1]{{diff|123|link text}} → link text{{diff|123|link text|section}} → link text (the link contains an anchor to #section){{diff|123&oldid{{=}}120|link text}} → link text (diff spanning multiple edits)