Wrote new Serial topic

docs/reference/serial/redirect-to.md

@@ -0,0 +1,31 @@
+# Serial Redirect To
+
+Dynamically configure the serial instance to use pins other than
+``USBTX`` and ``USBRX``.
+
+```sig
+serial.redirect(SerialPin.P0, SerialPin.P0, BaudRate.BaudRate115200);
+```
+
+### Parameters
+
+* ``tx``: the [serial pin](/device/pins) on which to transmit data 
+* ``rx``: the [serial pin](/device/pins) on which to receive data 
+* ``rate``: the baud rate at which to transmit and receive data (either `9600` or ``115200``)
+
+### Example
+
+When button ``A`` is pressed, the following example reconfigures the
+serial instance. The new configuration uses pin ``P1`` to transmit and
+``P2`` to receive, at a baud rate of `9600`.
+
+```blocks
+input.onButtonPressed(Button.A, () => {
+    serial.redirect(SerialPin.P1, SerialPin.P2, BaudRate.BaudRate9600);
+});
+```
+
+### See also
+
+[serial](/device/serial)
+