Update uncertainty structure description in README.rst example

Author: timeverettadams

README.rst

@@ -102,7 +102,11 @@ Example
 
     # Synthesize a controller
     omega = np.logspace(-3, 3, 61)
-    block_structure = np.array([[1, 1], [1, 1], [2, 2]])
+    block_structure = [
+        dkpy.ComplexFullBlock(1, 1),
+        dkpy.ComplexFullBlock(1, 1),
+        dkpy.ComplexFullBlock(2, 2),
+    ]
     K, N, mu, d_scale_fit_info, info = dk_iter.synthesize(
         eg["P"],
         eg["n_y"],