Some doc formatting and link, mostly on quantumcircuit.py file (Qiski…

…t/qiskit#9771)

* some doc formating and link, mostly on quantumcircuit.py file

* Update qiskit/circuit/quantumcircuit.py

Co-authored-by: Julien Gacon <gaconju@gmail.com>

* ident

* more typos

* more typos

* another iteration

* Bit and Register

* notes on Register and Bit

* Update qiskit/circuit/bit.py

Co-authored-by: Eric Arellano <14852634+Eric-Arellano@users.noreply.github.com>

* Update qiskit/circuit/register.py

Co-authored-by: Eric Arellano <14852634+Eric-Arellano@users.noreply.github.com>

---------

Co-authored-by: Julien Gacon <gaconju@gmail.com>
Co-authored-by: Eric Arellano <14852634+Eric-Arellano@users.noreply.github.com>
Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

qiskit_algorithms/optimizers/qnspsa.py

@@ -277,7 +277,7 @@ def get_fidelity(
             F(\theta, \phi) = \big|\langle 0 | U^\dagger(\theta) U(\phi) |0\rangle  \big|^2.
 
         The output of this function can be used as input for the ``fidelity`` to the
-        :class:~`qiskit.algorithms.optimizers.QNSPSA` optimizer.
+        :class:`~.QNSPSA` optimizer.
 
         Args:
             circuit: The circuit preparing the parameterized ansatz.