docs(aer_simulator.py): fixed typos

[alt-shreya]

Summary

fixes #1611
I removed two typos from the docs.
Next steps: list missing options and add them to the docs.

Details and comments

Will the following code help me check for missing functions?

for i in AerSimulator().available_methods():
    print(AerSimulator(method=i).options)

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[alt-shreya]

Following are the options that are not available on the documentation yet. Is there a definition for these options, or should I add one based on my understanding of Qiskit aer?

Automatic simulator options

shots
max_shot_size
fusion_enable
fusion_verbose
fusion_max_qubit
fusion_threshold
accept_distributed_results
noise_model
seed_simulator
blocking_qubits
chunk_swap_buffer_qubits
batched_shots_gpu
batched_shots_gpu_max_qubits
num_threads_per_device
statevector_parallel_threshold
statevector_sample_measure_opt
stabilizer_max_snapshot_probabilities
extended_stabilizer_sampling_method
extended_stabilizer_metropolis_mixing_time
extended_stabilizer_approximation_error
extended_stabilizer_norm_estimation_samples
extended_stabilizer_norm_estimation_repetitions
extended_stabilizer_parallel_threshold
extended_stabilizer_probabilities_snapshot_samples
matrix_product_state_truncation_threshold
matrix_product_state_max_bond_dimension
mps_sample_measure_algorithm
mps_log_data
mps_swap_direction
chop_threshold
mps_parallel_threshold
mps_omp_threads
tensor_network_num_sampling_qubits
use_cuTensorNet_autotuning

[hhorii]

Simulator options for automatic method do not need documentation. Aer determines a method based on characteristics of circuits and apply parameters of the method if they specified.

[hhorii]

Thank you for your contribution. This PR looks good to me.

[hhorii]

Let me close this PR because other merged PR includes this typo with other fixes.