Remove .md extensions, is "See also" special

Author: microbit-robert

docs/ml_is_event_detected.md

@@ -8,7 +8,7 @@ ml.isDetected(ml.event.Unknown)
 
 The ML model updates its estimated action several times a second. This function compares the latest value of the estimated value to the action you choose. Use the boolean value to make logical decisions in your program.
 
-Some programs will be easier to write using the [on ML start](./ml_on_event_start.md) and [on ML stop](./ml_on_event_stop.md) event handlers instead.
+Some programs will be easier to write using the [on ML start](./ml_on_event_start) and [on ML stop](./ml_on_event_stop) event handlers instead.
 
 ## Parameters
 
@@ -30,6 +30,10 @@ basic.forever(function () {
 })
 ```
 
+## See also
+
+- [write file](./ml_on_event_start)
+
 ```package
 machine-learning-help-stubs=github:microbit-foundation/pxt-microbit-ml-help-stubs#v0.0.1
 machine-learning=github:microbit-foundation/pxt-microbit-ml#v1.0.2