Update docs/api.md.

Co-authored-by: Leonardo Cavagnis <[email protected]>

docs/api.md

@@ -189,7 +189,7 @@ AdvancedDAC dac1(A13);
 
 ### `AdvancedDAC.begin()`
 
-Initializes the DAC with the specified parameters. To reconfigure the DAC, `stop()` must be called first. The DAC has a special mode called `loop mode` enabled by setting loop to true. In loop mode, the DAC will start automatically after all buffers are filled, and continuously cycle through over all buffers.
+Initializes the DAC with the specified parameters. To reconfigure the DAC, `stop()` must be called first. The DAC has a special mode called _loop mode_ enabled by setting `loop` parameter to `true`. In loop mode, the DAC will start automatically after all buffers are filled, and continuously cycle through over all buffers.
 
 #### Syntax