Fix comments and internal names about SEEK operation.

Legacy radio HAL named it SCAN and the name slipped through HAL 1.x
into HAL 2.0. I finally noticed it after HAL 2.0 was locked down.

Bug: 109740376
Test: build ow
Change-Id: I5ca4147227a7dd0c32248a279f03fb632d97258e
diff --git a/broadcastradio/2.0/ITunerCallback.hal b/broadcastradio/2.0/ITunerCallback.hal
index b20a0b2..a174c9c 100644
--- a/broadcastradio/2.0/ITunerCallback.hal
+++ b/broadcastradio/2.0/ITunerCallback.hal
@@ -18,7 +18,8 @@
 interface ITunerCallback {
     /**
      * Method called by the HAL when a tuning operation fails asynchronously
-     * following a step(), scan() or tune() command.
+     * following ITunerSession::tune(), ITunerSession::scan() or
+     * ITunerSession::step().
      *
      * This callback is only called when the step(), scan() or tune() command
      * returned OK at first.