cpupower: fix reference to nonexistent document

This file was renamed from .txt to .rst and left a dangling reference.
Fix it.

Fixes: 151f4e2 ("docs: power: convert docs to ReST and rename to *.rst")
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Srivatsa S. Bhat (VMware) <[email protected]>
Cc: Srinivas Pandruvada <[email protected]>
Cc: Jacob Pan <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Len Brown <[email protected]>
Signed-off-by: Vegard Nossum <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: vegard

tools/power/cpupower/man/cpupower-powercap-info.1

@@ -17,7 +17,7 @@ settings of all cores, see cpupower(1) how to choose specific cores.
 .SH "DOCUMENTATION"
 
 kernel sources:
-Documentation/power/powercap/powercap.txt
+Documentation/power/powercap/powercap.rst
 
 
 .SH "SEE ALSO"