Fix bulleted list in docs (and add headings to help) (#29)

* Fix bulleted list in docs

* Sub-headings

README.md

@@ -92,6 +92,8 @@ async def main() -> None:
 asyncio.run(main())
 ```
 
+### Method Parameters
+
 - `fields` (required): The sensor data fields to include
 - `location_type` (optional): An LocationType to filter by
 - `max_age` (optional): Filter results modified within these seconds
@@ -120,6 +122,8 @@ async def main() -> None:
 asyncio.run(main())
 ```
 
+### Method Parameters
+
 - `sensor_index` (required): The sensor index of the sensor to retrieve.
 - `fields` (optional): The sensor data fields to include.
 - `read_key` (optional): A read key for a private sensor.
@@ -130,6 +134,12 @@ This method returns a list of `NearbySensorResult` objects that are within a bou
 around a given latitude/longitude pair. The list is sorted from nearest to furthest
 (i.e., the first index in the list is the closest to the latitude/longitude).
 
+`NearbySensorResult` objects have two properties:
+
+- `sensor`: the corresponding `SensorModel` object
+- `distance`: the calculated distance (in kilometers) between this sensor and the provided
+  latitude/longitude
+
 ```python
 import asyncio
 
@@ -148,11 +158,7 @@ async def main() -> None:
 asyncio.run(main())
 ```
 
-`NearbySensorResult` objects have two properties:
-
-- `sensor`: the corresponding `SensorModel` object
-- `distance`: the calculated distance (in kilometers) between this sensor and the provided
-  latitude/longitude
+### Method Parameters
 
 - `fields` (required): The sensor data fields to include
 - `latitude` (required): The latitude of the point to measure distance from