synthio: doc fixes

Author: jepler

shared-bindings/synthio/Math.c

@@ -54,6 +54,8 @@ MAKE_ENUM_VALUE(synthio_math_operation_type, math_op, ABS, OP_ABS);
 //| class MathOperation:
 //|     """Operation for a Math block"""
 //|
+//|     def __call__(self, a: BlockInput, b: BlockInput = 0.0, c: BlockInput = 1.0) -> Math:
+//|         """A MathOperation enumeration value can be called to construct a Math block that performs that operation"""
 //|     SUM: "MathOperation"
 //|     """Computes ``a+b+c``. For 2-input sum, set one argument to ``0.0``. To hold a control value for multiple subscribers, set two arguments to ``0.0``."""
 //|

shared-bindings/synthio/Synthesizer.c

@@ -275,7 +275,7 @@ MP_PROPERTY_GETTER(synthio_synthesizer_pressed_obj,
 //|
 //|     This can be used to implement 'free-running' LFOs. LFOs associated with playing notes are advanced whether or not they are in this list.
 //|
-//|     This property is read-only but its contents may be modified by e.g., calling ``synth.lfos.append()` or ``synth.lfos.remove(). It is initially an empty list."""
+//|     This property is read-only but its contents may be modified by e.g., calling ``synth.lfos.append()`` or ``synth.lfos.remove()``. It is initially an empty list."""
 //|
 STATIC mp_obj_t synthio_synthesizer_obj_get_lfos(mp_obj_t self_in) {
     synthio_synthesizer_obj_t *self = MP_OBJ_TO_PTR(self_in);

shared-bindings/synthio/__init__.c

@@ -65,7 +65,10 @@ static const mp_arg_t envelope_properties[] = {
 //| """
 //|
 //| BlockInput = Union["Math", "LFO", float, None]
-//| """Blocks and Notes can take any of these types as inputs on certain attributes"""
+//| """Blocks and Notes can take any of these types as inputs on certain attributes
+//|
+//| A BlockInput can be any of the following types: `Math`, `LFO`, `float`, `None` (treated same as 0).
+//| """
 //|
 //| class Envelope:
 //|     def __init__(