remove "How to" from how-to guide titles (#500)

Author: kevinsung

docs/how-to-guides/entanglement-forging.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to simulate entanglement forging\n",
+    "# Simulate entanglement forging\n",
     "\n",
     "In this guide, we show how to simulate [entanglement forging](https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.3.010309).\n",
     "\n",

docs/how-to-guides/fermion-operator.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to use the FermionOperator class\n",
+    "# The FermionOperator class\n",
     "\n",
     "This guide shows how to use the [FermionOperator](https://qiskit-community.github.io/ffsim/api/ffsim.html#ffsim.FermionOperator) class to represent arbitrary fermionic operators.\n",
     "\n",

docs/how-to-guides/qiskit-circuits-sim.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to simulate excitation-preserving Qiskit circuits\n",
+    "# Simulate excitation-preserving Qiskit circuits\n",
     "\n",
     "ffsim supports the simulation of a restricted class of Qiskit circuits built from gates in the Qiskit circuit library. The simulation is accomplished by mapping the qubits to fermions. The circuits that can be simulated are those whose gates, except for state preparation and measurement, are \"excitation-preserving,\" that is, they do not alter the Hamming weight of computational basis states. Concretely, the circuit should have the following structure:\n",
     "\n",

docs/how-to-guides/qiskit-lucj.ipynb

@@ -5,7 +5,7 @@
    "id": "851418ae",
    "metadata": {},
    "source": [
-    "# How to build Qiskit circuits for the LUCJ ansatz\n",
+    "# Build Qiskit circuits for the LUCJ ansatz\n",
     "\n",
     "This guide provides some examples of building and transpiling Qiskit circuits to implement the [LUCJ ansatz](../explanations/lucj.ipynb)."
    ]

docs/how-to-guides/qiskit-merge-orbital-rotations.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to merge orbital rotations in Qiskit circuits\n",
+    "# Merge orbital rotations in Qiskit circuits\n",
     "\n",
     "Due to the homomorphism property of [orbital rotations](../explanations/orbital-rotation.ipynb), adjacent orbital rotations occurring in a quantum circuit can be merged into a single orbital rotation, reducing the number of gates that result when the circuit is decomposed into more basic gates.\n",
     "\n",

docs/how-to-guides/qiskit-trotter.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to build Qiskit circuits for Trotterized Hamiltonian simulation\n",
+    "# Build Qiskit circuits for Trotterized Hamiltonian simulation\n",
     "\n",
     "This guide provides some examples of building and transpiling Qiskit circuits for Trotterized time evolution of various Hamiltonians."
    ]

docs/how-to-guides/simulate-lucj.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to simulate the local unitary cluster Jastrow (LUCJ) ansatz\n",
+    "# Simulate the local unitary cluster Jastrow (LUCJ) ansatz\n",
     "\n",
     "In this guide, we show how to use ffsim to simulate the [local unitary cluster Jastrow (LUCJ) ansatz](../explanations/lucj.ipynb). We'll use it to calculate an approximation to the ground state energy of an ethene molecule.\n",
     "\n",

docs/how-to-guides/simulate-trotter-hubbard.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to simulate Trotterized time evolution for the Fermi-Hubbard model\n",
+    "# Simulate Trotterized time evolution for the Fermi-Hubbard model\n",
     "\n",
     "In this guide, we show how to use ffsim to simulate Trotterized time evolution for the Fermi-Hubbard model using the split-operator method. In the split-operator method, the Hamiltonian is expressed as a sum of two terms, the one-body part and the two-body part, for the purposes of the Trotter product formula.\n",
     "\n",

docs/how-to-guides/simulate-trotter-mol-ham.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# How to simulate Trotterized time evolution for the molecular Hamiltonian\n",
+    "# Simulate Trotterized time evolution for the molecular Hamiltonian\n",
     "\n",
     "In this guide, we show how to use ffsim to simulate Trotterized time evolution for the molecular Hamiltonian in the [double-factorized representation](../explanations/double-factorized.ipynb).\n",
     "\n",