Wrote new Serial topic

docs/reference/serial/write-string.md

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+# Serial Write String
+
+Write a string to the [serial](/device/serial) port,
+without starting a new line afterward.
+
+```sig
+serial.writeString("");
+```
+
+### Parameters
+
+* `text` is the [string](/reference/types/string) to write to the serial port
+
+### Example: simple serial
+
+This program writes the word `JUMBO` to the serial port repeatedly,
+without any new lines.
+
+```blocks
+basic.forever(() => {
+    serial.writeString("JUMBO");
+    basic.pause(1000);
+});
+```
+
+### See also
+
+[serial](/device/serial),
+[serial write line](/reference/serial/write-line),
+[serial write number](/reference/serial/write-number),
+[serial write value](/reference/serial/write-value)