doc improvements

tests/test_sdf.py

@@ -80,7 +80,7 @@ def test_b14(mydir):
 def test_gates(mydir):
     c = verilog.load(mydir / 'gates.v')
     df = sdf.load(mydir / 'gates.sdf')
-    lt = df.annotation(c, dataset=1)
+    lt = df.iopaths(c)[1]
     nand_a = c.cells['nandgate'].ins[0]
     nand_b = c.cells['nandgate'].ins[1]
     and_a = c.cells['andgate'].ins[0]