Kwargs: assert functions (#6406)

Closes https://github.com/KittyCAD/modeling-app/issues/6408

rust/kcl-lib/src/std/convert.rs

@@ -22,7 +22,7 @@ pub async fn int(_exec_state: &mut ExecState, args: Args) -> Result<KclValue, Kc
 ///
 /// ```no_run
 /// n = int(ceil(5/2))
-/// assertEqual(n, 3, 0.0001, "5/2 = 2.5, rounded up makes 3")
+/// assert(n, isEqualTo = 3, error = "5/2 = 2.5, rounded up makes 3")
 /// // Draw n cylinders.
 /// startSketchOn('XZ')
 ///   |> circle(center = [0, 0], radius = 2 )