Rewrote/expanded serial topic

docs/reference/serial/write-line.md

@@ -1,14 +1,32 @@
-# Write Line
+# Serial Write Line
 
-Writes a string and a new line character (`\r\n`) to [serial](/device/serial).
+Write a string to the [serial](/device/serial) port and start a new line of text
+by writing `\r\n`.
 
 ```sig
 serial.writeLine("");
 ```
 
+### Parameters
+
+* `line` is the [string](/reference/types/string) to write to the serial port
+
+### Example
+
+This program writes the word `BOFFO` to the serial port repeatedly.
+
+```blocks
+basic.forever(() => {
+    serial.writeLine("BOFFO");
+    basic.pause(5000);
+});
+```
+
 ### Example: streaming data
 
-The following example constantly checks the [compass heading](/reference/input/compass-heading) and sends the direction to serial.
+This program checks the
+[compass heading](/reference/input/compass-heading) and sends the
+direction to the serial port repeatedly.
 
 ```blocks
 basic.forever(() => {
@@ -26,8 +44,7 @@ basic.forever(() => {
     }
 })
 ```
-
 ### See also
 
-[serial](/device/serial), [write value](/reference/serial/write-value)
-
+[serial](/device/serial),
+[serial write value](/reference/serial/write-value)