Fix doctests and builds in various files (#6233)

* Fix doctest in hamming distance

* add line break

* try to fix quantum_riper_adder

* fix floating point build

arithmetic_analysis/in_static_equilibrium.py

@@ -19,8 +19,11 @@ def polar_force(
     True
     >>> math.isclose(force[1], 7.0710678118654755)
     True
-    >>> polar_force(10, 3.14, radian_mode=True)
-    [-9.999987317275396, 0.01592652916486828]
+    >>> force = polar_force(10, 3.14, radian_mode=True)
+    >>> math.isclose(force[0], -9.999987317275396)
+    True
+    >>> math.isclose(force[1], 0.01592652916486828)
+    True
     """
     if radian_mode:
         return [magnitude * cos(angle), magnitude * sin(angle)]

quantum/ripple_adder_classic.py

@@ -3,7 +3,7 @@
 # https://en.wikipedia.org/wiki/Controlled_NOT_gate
 
 from qiskit import Aer, QuantumCircuit, execute
-from qiskit.providers import BaseBackend
+from qiskit.providers import Backend
 
 
 def store_two_classics(val1: int, val2: int) -> tuple[QuantumCircuit, str, str]:
@@ -62,7 +62,7 @@ def full_adder(
 def ripple_adder(
     val1: int,
     val2: int,
-    backend: BaseBackend = Aer.get_backend("qasm_simulator"),  # noqa: B008
+    backend: Backend = Aer.get_backend("qasm_simulator"),  # noqa: B008
 ) -> int:
     """
     Quantum Equivalent of a Ripple Adder Circuit

strings/hamming_distance.py

@@ -18,6 +18,8 @@ def hamming_distance(string1: str, string2: str) -> int:
     >>> hamming_distance("00000", "11111")
     5
     >>> hamming_distance("karolin", "kath")
+    Traceback (most recent call last):
+      ...
     ValueError: String lengths must match!
     """
     if len(string1) != len(string2):