vdso/datapage: Correct struct member kernel-doc

Remove the "[]" array indicators from the struct member descriptions
to avoid kernel-doc warnings.

Warning: include/vdso/datapage.h:107 struct member 'basetime' not
 described in 'vdso_clock'
Warning: include/vdso/datapage.h:107 struct member 'offset' not described
 in 'vdso_clock'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260228071711.2663851-1-rdunlap@infradead.org

include/vdso/datapage.h

@@ -80,8 +80,8 @@ struct vdso_timestamp {
  * @mask:		clocksource mask
  * @mult:		clocksource multiplier
  * @shift:		clocksource shift
- * @basetime[clock_id]:	basetime per clock_id
- * @offset[clock_id]:	time namespace offset per clock_id
+ * @basetime:		basetime per clock_id
+ * @offset:		time namespace offset per clock_id
  *
  * See also struct vdso_time_data for basic access and ordering information as
  * struct vdso_clock is used there.