Add note about default baud rate is 9600

Jenny Plunkett · web-flow · commit b31bc766e661 · 2018-10-12T13:40:23.000-05:00
diff --git a/drivers/Serial.h b/drivers/Serial.h
@@ -63,7 +63,7 @@ class Serial : public SerialBase, public Stream, private NonCopyable<Serial> {
      *  @param tx Transmit pin
      *  @param rx Receive pin
      *  @param name The name of the stream associated with this serial port (optional)
-     *  @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
+     *  @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE or 9600)
      *
      *  @note
      *    Either tx or rx may be specified as NC (Not Connected) if unused

Original file line number	Diff line number	Diff line change
`@@ -63,7 +63,7 @@ class Serial : public SerialBase, public Stream, private NonCopyable<Serial> {`
`63`	`63`	`* @param tx Transmit pin`
`64`	`64`	`* @param rx Receive pin`
`65`	`65`	`* @param name The name of the stream associated with this serial port (optional)`
`66`		`- * @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)`
	`66`	`+ * @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE or 9600)`
`67`	`67`	`*`
`68`	`68`	`* @note`
`69`	`69`	`* Either tx or rx may be specified as NC (Not Connected) if unused`