pybricks.parameters.Stop: Document COAST_SMART.

See https://github.com/pybricks/pybricks-api/issues/104

doc/main/parameters/stop.rst

@@ -10,6 +10,9 @@ Stop
     .. autoattribute:: pybricks.parameters.Stop.COAST
         :annotation:
 
+    .. autoattribute:: pybricks.parameters.Stop.COAST_SMART
+        :annotation:
+
     .. autoattribute:: pybricks.parameters.Stop.BRAKE
         :annotation:
 

src/pybricks/parameters.py

@@ -157,6 +157,12 @@ class Stop(_PybricksEnum):
     COAST: Stop = 0
     """Let the motor move freely."""
 
+    COAST_SMART: Stop = 4
+    """Let the motor move freely. For the next relative angle maneuver,
+    take the last target angle (instead of the current angle) as the new
+    starting point. This reduces cumulative errors. This will apply only if the
+    current angle is less than twice the configured position tolerance."""
+
     BRAKE: Stop = 1
     """Passively resist small external forces."""