x86/tsc: Correct kernel-doc notation

Add or modify function descriptions to remove kernel-doc warnings:

tsc.c:655: warning: missing initial short description on line:
 * native_calibrate_tsc
tsc.c:1339: warning: Excess function parameter 'cycles' description in 'convert_art_ns_to_tsc'
tsc.c:1339: warning: Excess function parameter 'cs' description in 'convert_art_ns_to_tsc'
tsc.c:1373: warning: Function parameter or member 'work' not described in 'tsc_refine_calibration_work'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20231221033620.32379-1-rdunlap@infradead.org