Fix pydocstyle documentation issues

- Fix D213: Multi-line docstring summary should start at the second line
- Fix D413: Missing blank line after last section
- Fix D212: Multi-line docstring summary should start at the first line
- Fix D415: First line should end with a period
- Fix D204: 1 blank line required after class docstring
- Fix D203: 1 blank line required before class docstring
- Fix D409/D405: Section name capitalization and underline length

Author: Uli Köhler

UliEngineering/Chemistry/DNARNA.py

@@ -50,8 +50,9 @@ class DNANucleotideWeights:
 
 @dataclass
 class RNANucleotideWeights:
-    """
-    MolThis includes the backbone phosphate group.
+    """Molecular weights of the four RNA nucleotides in g/mol.
+
+    This includes the backbone phosphate group.
 
     Source: https://www.thermofisher.com/de/de/home/references/ambion-tech-support/rna-tools-and-calculators/dna-and-rna-molecular-weights-and-conversions.html
     """

UliEngineering/Chemistry/Kohlrausch.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-"""Kohlrausch's law of independent migration of ions.
+"""
+Kohlrausch's law of independent migration of ions.
 
 Kohlrausch's law states that the limiting molar conductivity of an electrolyte
 is the sum of the individual contributions of the cation and anion:

UliEngineering/Electronics/OpAmp.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-"""
-Utilities for operational amplifier calculations.
+"""Utilities for operational amplifier calculations.
 
 Usage example:
 >>> from UliEngineering.Electronics.OpAmp import summing_amplifier_noninv

UliEngineering/Electronics/PowerFactor.py

@@ -17,8 +17,8 @@ def power_factor_by_phase_angle(angle: NormalizableArgument = "10°", unit: str
     This approach only returns the correct power factor if current and voltage
     are both sinusoidal.
 
-    Keyword arguments:
-    ------------------
+    Keyword Arguments
+    ----------------
     angle : number or Engineer string
         The phase angle between current and voltage.
     unit : "degrees", "deg" or "radians", "rad", "radiant"

UliEngineering/Electronics/SwitchingRegulator.py

@@ -21,7 +21,8 @@
 
 @returns_unit("H")
 def buck_regulator_inductance(vin: VoltageV, vout: VoltageV, frequency: FrequencyHz, ioutmax: CurrentA, K=0.3):
-    """Compute the optimal inductance for use in a buck regulator.
+    """
+    Compute the optimal inductance for use in a buck regulator.
 
     This formula is based on the the inductor ripple current fraction [K].
 

UliEngineering/Math/Coordinates.py

@@ -8,8 +8,7 @@
 
 
 class BoundingBox(object):
-    """
-    A 2D bounding box.
+    """A 2D bounding box.
     """
 
     def __init__(self, points):

UliEngineering/Mechanics/Threads.py

@@ -15,6 +15,7 @@ class ThreadParameters(namedtuple("ThreadParameters", ["pitch", "outer_diameter"
         Outside thread diameter in mm (for exterior thread)
     inner_diameter:
         Inside thread diameter in mm (for exterior thread)
+
     """
 
 threads = {

UliEngineering/Physics/NoiseDensity.py

@@ -36,7 +36,7 @@ def noise_density(actual_noise: VoltageVolt, bandwith: FrequencyHz):
     """
     Compute the noise density given:
      - A noise density in x/√Hz where x is any unit
-     - A bandwith in ΔHz
+     - A bandwith in ΔHz.
 
     >>> formatValue(noiseDensity("1.0 mV", "100 Hz"), "V/√Hz")
 

UliEngineering/SignalProcessing/WrappedValues.py

@@ -14,6 +14,7 @@ class OnlineUnwrapper:
 
     Maintains state between calls.
     """
+
     def __init__(self, wrap_value=2**20, threshold=None):
         """
         Initialize the unwrapper.

UliEngineering/Units.py

@@ -20,8 +20,7 @@
 g = Unit("g")
 
 class UnannotatedReturnValueError(Exception):
-    """
-    Raise if the automatic unit finder cannot find the appropriate function.
+    """Raise if the automatic unit finder cannot find the appropriate function.
 
     The annotation tells an auto-formatting function which unit is being used.