ABI: sysfs-power: fix a what tag

There is one What tag that it is using semicolon instead of colon.

Fix it to comply with ABI description and produce right results when
converted to html/pdf.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/508051[e-mail]

Documentation/ABI/testing/sysfs-power

···
 		CAUTION: Using it will cause your machine's real-time (CMOS)
 		clock to be set to a random invalid time after a resume.
 
-What;		/sys/power/pm_trace_dev_match
+What:		/sys/power/pm_trace_dev_match
 Date:		October 2010
 Contact:	James Hogan <[e-mail]>
 Description: