DOCS-3827: Update analog example (#891)

Author: JessamyT

src/viam/components/board/board.py

@@ -68,7 +68,7 @@ async def read(self, *, extra: Optional[Dict[str, Any]] = None, timeout: Optiona
                 my_board = Board.from_robot(robot=machine, name="my_board")
 
                 # Get the Analog "my_example_analog_reader".
-                reader = await my_board.analog_reader_by_name(
+                reader = await my_board.analog_by_name(
                     name="my_example_analog_reader")
 
                 # Get the value of the digital signal "my_example_analog_reader" has most