added doc for wire.intersection

doc/examples.typ

@@ -140,4 +140,11 @@ element.block(id: "b3", w: 2, h: 3,
 wire.wire("w1", ("b1-port-out", "b3-port-in1"))
 wire.wire("w2", ("b2-port-out", "b3-port-in2"),
           style: "zigzag")
+```)
+
+#let intersection = example(```
+wire.wire("w1", ((0, 0), (1, 1)), style: "zigzag")
+wire.wire("w2", ((0, 0), (1, -.5)),
+          style: "zigzag", zigzag-ratio: 80%)
+wire.intersection("w1.zig")
 ```)

src/wire.typ

@@ -7,6 +7,11 @@
 #let signal-width = 1pt
 #let bus-width = 1.5pt
 
+/// Draws a wire intersection at the given anchor
+/// #examples.intersection
+/// - pt (point): A CeTZ compatible point / anchor
+/// - radius (number): The radius of the intersection
+/// - fill (color): The fill color
 #let intersection(pt, radius: .1, fill: black) = {
   draw.circle(pt, radius: radius, stroke: none, fill: fill)
 }