Add unique heading ID to serial.md

Amanda Butler · web-flow · commit cdfef94a62f2 · 2018-04-09T11:36:02.000-05:00
Add unique heading ID for linking best practices and rendering.
diff --git a/docs/reference/contributing/target/serial.md b/docs/reference/contributing/target/serial.md
@@ -1,3 +1,3 @@
-## Serial
+<h2 id="serial-port">Serial</h2>
 
 Implement the API declared in `mbed-os/hal/serial_api.h`. You must define the `serial_t` struct in `objects.h`. You may use the `serial_t` struct for referencing memory-mapped serial registers and passing related pin and peripheral operation information data that the HAL needs.

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`		`-## Serial`
	`1`	`+<h2 id="serial-port">Serial</h2>`
`2`	`2`
`3`	`3`	Implement the API declared in `mbed-os/hal/serial_api.h`. You must define the `serial_t` struct in `objects.h`. You may use the `serial_t` struct for referencing memory-mapped serial registers and passing related pin and peripheral operation information data that the HAL needs.