Updated title on ExpVal on Paramterized Circuits article. (#1336)

Updated title.

---------

Co-authored-by: David Wierichs <david.wierichs@xanadu.ai>
Co-authored-by: Josh Izaac <josh146@gmail.com>

Author: 3 people

demonstrations/tutorial_classical_expval_estimation.metadata.json

@@ -1,12 +1,12 @@
 {
-    "title": "Classically estimating expectation values from parametrized quantum circuits",
+    "title": "Pauli Propagation: Classically estimating expectation values from parametrized quantum circuits",
     "authors": [
         {
             "username": "dwierichs"
         }
     ],
     "dateOfPublication": "2024-09-10T00:00:00+00:00",
-    "dateOfLastModification": "2024-10-07T00:00:00+00:00",
+    "dateOfLastModification": "2025-04-03T00:00:00+00:00",
     "categories": [
         "Quantum Computing"
     ],

demonstrations/tutorial_classical_expval_estimation.py

@@ -1,6 +1,6 @@
 r"""
-Classically estimating expectation values from parametrized quantum circuits
-============================================================================
+Pauli Propagation: Classically estimating expectation values from parametrized quantum circuits
+===============================================================================================
 
 In the race between classical and `quantum computing <https://pennylane.ai/qml/quantum-computing/>`__, an important question
 is whether there exist efficient classical algorithms to simulate quantum