docs: tweaked docstrings to be in Google style

src/fixate/drivers/dmm/__init__.py

@@ -1,7 +1,8 @@
 """
-dmm is the digital multimeter driver.
+Digital multimeter driver
+=========================
 
-Use dmm.open to connect to a connected digital multimeter.
+Use `dmm.open()` to connect to a digital multimeter.
 Functions are dictated by the abstract superclass ``DMM`` in helper.py
 
 ::
@@ -22,6 +23,11 @@
 def open() -> DMM:
     """
     Connect to a digital multimeter.
+    
+    Searches for a configured instrument and returns the first one found.
+
+    Returns:
+        DMM: open connection to the DMM
     """
     for DMM in (Fluke8846A, Keithley6500):
         instrument = find_instrument_by_id(DMM.REGEX_ID)

src/fixate/drivers/dmm/helper.py

@@ -11,7 +11,7 @@ def remote(self):
     def local(self):
         """
         Sets instrument to local mode
-        Use remote() to restore remote operation.
+        Use `remote()` to restore remote operation.
         """
         raise NotImplementedError
 
@@ -32,15 +32,21 @@ def measurement(self, delay=None):
         """
         Trigger and return measurement from the instrument buffer.
 
-        delay: If True, waits for self.measurement_delay seconds then triggers a measurement.
-        returns: a single value as a float
+        Args:
+            delay (bool): If True, waits for `self.measurement_delay` seconds then triggers a measurement.
+
+        Returns:
+            float: measured value
         """
         raise NotImplementedError
 
     def voltage_ac(self, _range=None):
         """
         Sets the DMM in AC voltage measurement mode and puts it in the range given
         by the argument _range. Signals expected to be measured must be < _range.
+
+        Args:
+            _range (???): The range to set the DMM to.
         """
         raise NotImplementedError