kinetis tone_alarm: Remove stale documentation

    Since tune control came in this driver does not have a
    have a test based interface. The module Documentation
    has been moved to tune_control

src/drivers/kinetis/tone_alarm/tone_alarm.cpp

@@ -31,59 +31,10 @@
  *
  ****************************************************************************/
 
-/**
- * Driver for the PX4 audio alarm port, /dev/tone_alarm.
- *
- * The tone_alarm driver supports a set of predefined "alarm"
- * tunes and one user-supplied tune.
- *
- * The TONE_SET_ALARM ioctl can be used to select a predefined
- * alarm tune, from 1 - <TBD>.  Selecting tune zero silences
- * the alarm.
- *
- * Tunes follow the syntax of the Microsoft GWBasic/QBasic PLAY
- * statement, with some exceptions and extensions.
- *
- * From Wikibooks:
- *
- * PLAY "[string expression]"
- *
- * Used to play notes and a score ... The tones are indicated by letters A through G.
- * Accidentals are indicated with a "+" or "#" (for sharp) or "-" (for flat)
- * immediately after the note letter. See this example:
- *
- *   PLAY "C C# C C#"
- *
- * Whitespaces are ignored inside the string expression. There are also codes that
- * set the duration, octave and tempo. They are all case-insensitive. PLAY executes
- * the commands or notes the order in which they appear in the string. Any indicators
- * that change the properties are effective for the notes following that indicator.
- *
- * Ln     Sets the duration (length) of the notes. The variable n does not indicate an actual duration
- *        amount but rather a note type; L1 - whole note, L2 - half note, L4 - quarter note, etc.
- *        (L8, L16, L32, L64, ...). By default, n = 4.
- *        For triplets and quintets, use L3, L6, L12, ... and L5, L10, L20, ... series respectively.
- *        The shorthand notation of length is also provided for a note. For example, "L4 CDE L8 FG L4 AB"
- *        can be shortened to "L4 CDE F8G8 AB". F and G play as eighth notes while others play as quarter notes.
- * On     Sets the current octave. Valid values for n are 0 through 6. An octave begins with C and ends with B.
- *        Remember that C- is equivalent to B.
- * < >    Changes the current octave respectively down or up one level.
- * Nn     Plays a specified note in the seven-octave range. Valid values are from 0 to 84. (0 is a pause.)
- *        Cannot use with sharp and flat. Cannot use with the shorthand notation neither.
- * MN     Stand for Music Normal. Note duration is 7/8ths of the length indicated by Ln. It is the default mode.
- * ML     Stand for Music Legato. Note duration is full length of that indicated by Ln.
- * MS     Stand for Music Staccato. Note duration is 3/4ths of the length indicated by Ln.
- * Pn     Causes a silence (pause) for the length of note indicated (same as Ln).
- * Tn     Sets the number of "L4"s per minute (tempo). Valid values are from 32 to 255. The default value is T120.
- * .      When placed after a note, it causes the duration of the note to be 3/2 of the set duration.
- *        This is how to get "dotted" notes. "L4 C#." would play C sharp as a dotted quarter note.
- *        It can be used for a pause as well.
- *
- * Extensions/variations:
- *
- * MB MF  The MF command causes the tune to play once and then stop. The MB command causes the
- *        tune to repeat when it ends.
- *
+/*
+ * Low Level Driver for the PX4 audio alarm port. Subscribes to
+ * tune_control and plays notes on this architecture specific
+ * timer HW
  */
 
 #include <px4_config.h>