Fix spelling in several simulator tutorials and math mode of opflow and grover tutorials (Qiskit/qiskit-tutorials#1163)

* Fix spelling in simulator tutorials and math mode of opflow tutorial

* Fix math mode and list of Grover tutorial

Co-authored-by: SooluThomas <[email protected]>

Author: t-imamichi

docs/tutorials/07_grover.ipynb

@@ -267,7 +267,7 @@
     "### State preparation\n",
     "\n",
     "A `state_preparation` argument is used to specify a quantum circuit that prepares a quantum state for the start point of the amplitude amplification.\n",
-    "By default, a circuit with $H^{\\otimes n} $ is used to prepare uniform superposition (so it will be Grover's search). The diffusion circuit of the amplitude amplification reflects `state_preparation` automatically."
+    "By default, a circuit with $H^{\\otimes n}$ is used to prepare uniform superposition (so it will be Grover's search). The diffusion circuit of the amplitude amplification reflects `state_preparation` automatically."
    ]
   },
   {
@@ -350,7 +350,8 @@
     "For more advanced use, it is also possible to specify the entire Grover operator by setting the `grover_operator` argument. This might be useful if you know more efficient implementation for $\\mathcal{Q}$ than the default construction via zero reflection, oracle and state preparation.\n",
     "\n",
     "The `qiskit.circuit.library.GroverOperator` can be a good starting point and offers more options for an automated construction of the Grover operator. You can for instance \n",
-    "* set the `mcx_mode` \n",
+    "\n",
+    "* set the `mcx_mode`\n",
     "* ignore qubits in the zero reflection by setting `reflection_qubits`\n",
     "* explicitly exchange the $\\mathcal{S_f}, \\mathcal{S_0}$ and $\\mathcal{A}$ operations using the `oracle`, `zero_reflection` and `state_preparation` arguments"
    ]