The cpupower-idle-info(1) man page describes '-f' as the short form of the
'--silent' option and '-e' as the short form of the '--proc' option.
But they are not correct:

$ cpupower idle-info -f
idle-info: invalid option -- 'f'
invalid or unknown argument
$ cpupower idle-info -e
idle-info: invalid option -- 'e'
invalid or unknown argument

The short form of '--silent' is actually '-s' and the short form of
'--proc' is actually '-o':

cpuidle-info.c:
	{"silent", no_argument, NULL, 's'},
	{"proc", no_argument, NULL, 'o'},

Signed-off-by: Roberto Ricci <io@r-ricci.it>
---
 tools/power/cpupower/man/cpupower-idle-info.1 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/power/cpupower/man/cpupower-idle-info.1 b/tools/power/cpupower/man/cpupower-idle-info.1
index 20b6345c53ad..b2f92aba5f5b 100644
--- a/tools/power/cpupower/man/cpupower-idle-info.1
+++ b/tools/power/cpupower/man/cpupower-idle-info.1
@@ -11,10 +11,10 @@ A tool which prints out per cpu idle information helpful to developers and inter
 .SH "OPTIONS"
 .LP
 .TP
-\fB\-f\fR \fB\-\-silent\fR
+\fB\-s\fR \fB\-\-silent\fR
 Only print a summary of all available C-states in the system.
 .TP
-\fB\-e\fR \fB\-\-proc\fR
+\fB\-o\fR \fB\-\-proc\fR
 deprecated.
 Prints out idle information in old /proc/acpi/processor/*/power format. This
 interface has been removed from the kernel for quite some time, do not let
-- 
2.53.0