message: docs(api): Correct references to flow rate attributes
  Closes
diff: @@ -146,10 +146,10 @@ class InstrumentContext(CommandPublisher):
  robot will aspirate from the exact specified location.
  If unspecified, the robot will aspirate from the
  current position.
  - :param rate: The relative plunger speed for this aspirate. During
  - this aspirate, the speed of the plunger will be
  - `rate` * :py:attr:`aspirate_speed`. If not specified,
  - defaults to 1.0 (speed will not be modified).
  + :param rate: A relative modifier for how quickly to aspirate liquid.
  + The flow rate for this aspirate will be
  + `rate` * :py:attr:`flow_rate.aspirate <flow_rate>`.
  + If not specified, defaults to 1.0.
  :type rate: float
  :returns: This instance.
  @@ -245,10 +245,10 @@ class InstrumentContext(CommandPublisher):
  robot will dispense into the exact specified location.
  If unspecified, the robot will dispense into the
  current position.
  - :param rate: The relative plunger speed for this dispense. During
  - this dispense, the speed of the plunger will be
  - `rate` * :py:attr:`dispense_speed`. If not specified,
  - defaults to 1.0 (speed will not be modified).
  + :param rate: A relative modifier for how quickly to dispense liquid.
  + The flow rate for this dispense will be
  + `rate` * :py:attr:`flow_rate.dispense <flow_rate>`.
  + If not specified, defaults to 1.0.
  :type rate: float
  :returns: This instance.
  @@ -315,8 +315,12 @@ class InstrumentContext(CommandPublisher):
  e.g, `plate.rows()[0][0].bottom()`. If unspecified,
  the pipette will mix from its current position.
  :type location: types.Location
  - :param rate: Set plunger speed for this mix, where,
  - ``speed = rate * (aspirate_speed or dispense_speed)``
  + :param rate: A relative modifier for how quickly to aspirate and
  + dispense liquid during this mix. When aspirating, the flow
  + rate will be
  + `rate` * :py:attr:`flow_rate.aspirate <flow_rate>`,
  + and when dispensing, it will be
  + `rate` * :py:attr:`flow_rate.dispense <flow_rate>`.
  :raises NoTipAttachedError: If no tip is attached to the pipette.
  :returns: This instance
  